{"id":4862,"date":"2024-06-23T10:45:58","date_gmt":"2024-06-23T02:45:58","guid":{"rendered":"https:\/\/seo.tenten.co\/en\/?p=4862"},"modified":"2024-06-23T10:55:44","modified_gmt":"2024-06-23T02:55:44","slug":"enhancing-website-speed-achieving-a-99-performance-grade-from-30","status":"publish","type":"post","link":"https:\/\/seo.tenten.co\/ja\/seo\/\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u901f\u5ea6\u3092\u5411\u4e0a\u3055\u305b\u300130\u304b\u308999\u306e\u30d1\u30d5\u30a9\/","title":{"rendered":"\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u901f\u5ea6\u306e\u5411\u4e0a: 99% \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9 \u30b0\u30ec\u30fc\u30c9\u306e\u9054\u6210 (30 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UX\u3001\u4e00\u6d41\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u901a\u3058\u3066\u30b3\u30f3\u30d0\u30fc\u30b8\u30e7\u30f3\u7387\u3092\u9ad8\u3081\u307e\u3059\u3002<\/li>\n<li>SEO \u3092\u5f37\u5316\u3057\u3001\u691c\u7d22\u30a8\u30f3\u30b8\u30f3\u3067\u306e\u53ef\u8996\u6027\u3092\u9ad8\u3081\u307e\u3059\u3002<\/li>\n<li>\u65b0\u3057\u3044\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3084\u9867\u5ba2\u30ec\u30d3\u30e5\u30fc\u3092\u7d39\u4ecb\u3059\u308b\u3053\u3068\u3067\u3001\u30d6\u30e9\u30f3\u30c9\u30a4\u30e1\u30fc\u30b8\u3092\u5f37\u5316\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u3053\u308c\u3089\u306e\u76ee\u6a19\u306b\u57fa\u3065\u3044\u3066\u3001\u7d71\u5408\u3059\u308b\u5fc5\u8981\u306e\u3042\u308b\u6a5f\u80fd\u3092\u6c7a\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002\u76ee\u6a19\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306b\u8003\u6848\u3057\u305f\u91cd\u8981\u306a\u6a5f\u80fd\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<ul>\n<li> 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href=\"https:\/\/www.gatsbyjs.com\/\">@\u30b9\u30c8\u30e9\u30d4<\/a>\u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u3067\u3059\u3002\u3053\u306e\u30b7\u30b9\u30c6\u30e0\u306b\u3088\u308a\u3001\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3057\u3001\u30c6\u30ad\u30b9\u30c8\u3001\u753b\u50cf\u3001\u52d5\u753b\u306a\u3069\u306e\u3055\u307e\u3056\u307e\u306a\u30b3\u30f3\u30c6\u30f3\u30c4\u5f62\u5f0f\u3092\u7ba1\u7406\u3059\u308b\u305f\u3081\u306e API 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\u3068\u30b7\u30fc\u30e0\u30ec\u30b9\u306b\u4e92\u63db\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u30af\u30a8\u30ea\u5f62\u5f0f\u3092\u5b9a\u7fa9\u3057\u3001\u5fc5\u8981\u306a\u30d5\u30a3\u30fc\u30eb\u30c9\u3068\u95a2\u4fc2\u306e\u307f\u3092\u6307\u5b9a\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u4f59\u5206\u306a\u30c7\u30fc\u30bf\u304c\u56de\u907f\u3055\u308c\u3001\u30da\u30fc\u30b8\u306e\u8aad\u307f\u8fbc\u307f\u6642\u9593\u304c\u77ed\u7e2e\u3055\u308c\u307e\u3057\u305f\u3002<br \/>\n<a href=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F4qeyraes7wajqomfi0qa.png\"><img decoding=\"async\" src=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F4qeyraes7wajqomfi0qa.png\" alt=\"\u5f53\u30b5\u30a4\u30c8\u306e\u6280\u8853\u306e\u7d44\u307f\u5408\u308f\u305b\" \/><\/a><br \/>\n<em>\u6280\u8853\u306e\u878d\u5408\u306b\u3088\u308a\u3001\u6700\u9069\u306a\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u5b89\u5b9a\u6027\u3068\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3057\u305f\u3002<\/em><\/p>\n<p>\u5b8c\u6210\u3059\u308b\u3068\u3001\u65b0\u3057\u3044 Web \u30b5\u30a4\u30c8\u304c\u5b8c\u6210\u3057\u3001\u30e9\u30f3\u30ad\u30f3\u30b0\u304c\u4e0a\u304c\u308a\u3001\u30c7\u30b6\u30a4\u30f3\u3082\u4e00\u65b0\u3055\u308c\u307e\u3057\u305f\u3002\u6700\u521d\u306f\u305d\u3046\u3067\u3057\u305f\u304c\u3001\u305d\u306e\u5f8c\u3001\u72b6\u6cc1\u306f\u5f90\u3005\u306b\u60aa\u5316\u3057\u59cb\u3081\u307e\u3057\u305f\u3002\u65b0\u3057\u3044\u30da\u30fc\u30b8\u306e\u8ffd\u52a0\u3001\u3055\u307e\u3056\u307e\u306a\u5909\u66f4\u3001\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3 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octicon-link\"><\/span><\/a>\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u52b9\u7387\u3092\u8a08\u753b\u7684\u306b\u5411\u4e0a\u3055\u305b\u308b<\/h3>\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5927\u5e45\u306b\u5411\u4e0a\u3055\u305b\u308b\u305f\u3081\u306b\u3001Web \u30b5\u30a4\u30c8\u3092\u60a9\u307e\u305b\u3066\u3044\u308b\u4e3b\u306a\u554f\u984c\u3092\u7cbe\u67fb\u3057\u3001\u305d\u308c\u305e\u308c\u306e\u554f\u984c\u3092\u4fee\u6b63\u3059\u308b\u53d6\u308a\u7d44\u307f\u3092\u958b\u59cb\u3057\u307e\u3057\u305f\u3002\u4ee5\u4e0b\u3067\u306f\u3001\u4e3b\u8981\u306a\u8ab2\u984c\u3092\u3069\u306e\u3088\u3046\u306b\u514b\u670d\u3057\u305f\u304b\u3092\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<h3><a id=\"1-accelerating-network-connections-establishment-by-2x\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>1. \u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u63a5\u7d9a\u8a2d\u5b9a\u306e\u9ad8\u901f\u5316\u30922\u500d\u306b<\/h3>\n<p><a href=\"https:\/\/gtmetrix.com\/\">G\u30e1\u30c8\u30ea\u30af\u30b9<\/a>\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u8aad\u307f\u8fbc\u307f\u30d1\u30bf\u30fc\u30f3\u3092\u63cf\u5199\u3059\u308b\u30c4\u30fc\u30eb\u3067\u3042\u308b \u306f\u3001\u63a5\u7d9a\u6642\u9593\u304c\u9577\u304f\u306a\u308b\u539f\u56e0\u3068\u306a\u3063\u3066\u3044\u308b\u5916\u90e8\u30c9\u30e1\u30a4\u30f3\u306e\u30ea\u30bd\u30fc\u30b9\u3092\u7279\u5b9a\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3057\u305f\u3002<br \/>\n<a href=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fib2ybxxm0z5knguw3hnq.png\"><img decoding=\"async\" src=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fib2ybxxm0z5knguw3hnq.png\" alt=\"\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u6642\u9593\u306e\u56f3\" \/><\/a><br \/>\n<em>\u7d2b\u8272\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u306f\u3001\u30c9\u30e1\u30a4\u30f3 \u30cd\u30fc\u30e0 \u30b5\u30fc\u30d0\u30fc\u304c\u30c9\u30e1\u30a4\u30f3\u540d\u306e IP \u30a2\u30c9\u30ec\u30b9\u306e\u8981\u6c42\u3092\u53d7\u4fe1\u3059\u308b\u307e\u3067\u306e\u6642\u9593\u3092\u793a\u3057\u3001\u8584\u7dd1\u8272\u306f\u30b5\u30fc\u30d0\u30fc\u306e\u63a5\u7d9a\u6642\u9593\u3092\u793a\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u9593\u9694\u306f\u9577\u304b\u3063\u305f\u305f\u3081\u3001\u30b5\u30fc\u30d0\u30fc\u63a5\u7d9a\u6642\u9593\u3092\u6291\u5236\u3059\u308b\u3053\u3068\u3067\u77ed\u7e2e\u3057\u307e\u3057\u305f\u3002<\/em><\/p>\n<p>\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u9ad8\u901f\u5316\u306e\u305f\u3081\u306b\u3001\u3055\u307e\u3056\u307e\u306a\u6280\u8853\u7684\u5f37\u5316\u3092\u5b9f\u65bd\u3057\u307e\u3057\u305f\u3002\u6700\u521d\u306f\u3001HTML\u3092\u6d3b\u7528\u3057\u305f\u30ea\u30bd\u30fc\u30b9\u30d2\u30f3\u30c8\u3092\u5c0e\u5165\u3057\u307e\u3057\u305f\u3002 <code>&lt;link&gt;<\/code> \u5c5e\u6027\u3002\u3053\u308c\u3089\u306e\u30d2\u30f3\u30c8\u306b\u3088\u308a\u3001\u30ea\u30bd\u30fc\u30b9\u8981\u6c42\u304c\u30b5\u30fc\u30d0\u30fc\u306b\u8ee2\u9001\u3055\u308c\u308b\u524d\u306b\u3001\u30d6\u30e9\u30a6\u30b6\u304c\u7a4d\u6975\u7684\u306b\u63a5\u7d9a\u3092\u78ba\u7acb\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u5916\u90e8\u30c9\u30e1\u30a4\u30f3\u306e\u30ea\u30bd\u30fc\u30b9\u306e\u5834\u5408\u3001DNS \u30d7\u30ea\u30d5\u30a7\u30c3\u30c1\u3068\u4e8b\u524d\u63a5\u7d9a\u306e\u30d2\u30f3\u30c8\u3092\u7d44\u307f\u8fbc\u307f\u3001\u6307\u5b9a\u3055\u308c\u305f\u30c9\u30e1\u30a4\u30f3\u3068\u306e\u63a5\u7d9a\u3092\u958b\u59cb\u3059\u308b\u3088\u3046\u306b\u4e8b\u524d\u306b\u30d6\u30e9\u30a6\u30b6\u306b\u6307\u793a\u3057\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u30d6\u30e9\u30a6\u30b6\u304c\u5916\u90e8\u30c9\u30e1\u30a4\u30f3\u306e\u30ea\u30bd\u30fc\u30b9\u3092\u5fc5\u8981\u3068\u3059\u308b\u5834\u5408\u3001\u4e8b\u524d\u8a2d\u5b9a\u304c\u3059\u3067\u306b\u5b8c\u4e86\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u30ea\u30bd\u30fc\u30b9\u306f\u8fc5\u901f\u306b\u8aad\u307f\u8fbc\u307e\u308c\u307e\u3059\u3002<\/p>\n<p>\u30b9\u30af\u30ea\u30d7\u30c8\u3084\u30b9\u30bf\u30a4\u30eb\u30b7\u30fc\u30c8\u306a\u3069\u306e\u5185\u90e8\u30d5\u30a1\u30a4\u30eb\u306b\u95a2\u3057\u3066\u306f\u3001\u300c\u30d7\u30ea\u30ed\u30fc\u30c9\u300d\u3068\u300c\u30d7\u30ea\u30d5\u30a7\u30c3\u30c1\u300d\u306e\u30d2\u30f3\u30c8\u3092\u63a1\u7528\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u3089\u306e\u30d2\u30f3\u30c8\u306b\u3088\u308a\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30b5\u30a4\u30c8\u306e\u30da\u30fc\u30b8\u3092\u30ca\u30d3\u30b2\u30fc\u30c8\u3059\u308b\u3068\u304d\u306b\u3001\u91cd\u8981\u306a\u30ea\u30bd\u30fc\u30b9\u304c\u30ed\u30fc\u30ab\u30eb \u30ad\u30e3\u30c3\u30b7\u30e5\u304b\u3089\u53d6\u5f97\u3055\u308c\u3001\u30ea\u30e2\u30fc\u30c8 \u30b5\u30fc\u30d0\u30fc\u304b\u3089\u53d6\u5f97\u3059\u308b\u5fc5\u8981\u304c\u306a\u304f\u306a\u308a\u3001\u30d7\u30ed\u30bb\u30b9\u304c\u8fc5\u901f\u5316\u3055\u308c\u307e\u3059\u3002<\/p>\n<p><strong>\u3053\u308c\u3089\u306e\u6700\u9069\u5316\u306b\u3088\u308a\u3001*Largest Contentful Paint \u304c 2.9 \u79d2\u304b\u3089 0.8 \u79d2\u306b\u77ed\u7e2e\u3055\u308c\u3001*First Contentful Paint \u304c 1 \u79d2\u304b\u3089 0.6 \u79d2\u306b\u77ed\u7e2e\u3055\u308c\u3001\u30d6\u30e9\u30a6\u30b6\u306f\u30ea\u30bd\u30fc\u30b9\u306e\u8aad\u307f\u8fbc\u307f\u3092\u9ad8\u901f\u5316\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/strong><\/p>\n<p>*LCP\u3001<a href=\"https:\/\/developers.google.com\/search\/docs\/appearance\/core-web-vitals\">\u5fc5\u9808\u30a6\u30a7\u30d6\u30d0\u30a4\u30bf\u30eb\u6e2c\u5b9a <\/a> \u30e6\u30fc\u30b6\u30fc\u304c\u30da\u30fc\u30b8\u306e\u8aad\u307f\u8fbc\u307f\u3092\u958b\u59cb\u3057\u3066\u304b\u3089\u3001\u6700\u3082\u76ee\u7acb\u3064\u753b\u50cf\u304c\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\u306b\u8868\u793a\u3055\u308c\u308b\u307e\u3067\u306e\u6642\u9593\u3092\u5b9a\u91cf\u5316\u3057\u307e\u3059\u3002<\/p>\n<p>*FCP \u306f\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30da\u30fc\u30b8\u306b\u6700\u521d\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3066\u304b\u3089\u30b3\u30f3\u30c6\u30f3\u30c4\u304c\u753b\u9762\u306b\u8868\u793a\u3055\u308c\u308b\u307e\u3067\u306e\u9593\u9694\u3092\u8868\u3057\u307e\u3059\u3002<\/p>\n<h3><a id=\"achieving-better-font-loading-with-fast-text-rendering\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>\u9ad8\u901f\u30c6\u30ad\u30b9\u30c8\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306b\u3088\u308b\u30d5\u30a9\u30f3\u30c8\u8aad\u307f\u8fbc\u307f\u306e\u5f37\u5316<\/h3>\n<p>\u5f53\u793e\u306e\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3067\u306f\u3001\u30d1\u30fc\u30bd\u30ca\u30e9\u30a4\u30ba\u3055\u308c\u305f\u30d5\u30a9\u30f3\u30c8\u3068\u516c\u958b\u30d5\u30a9\u30f3\u30c8\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002Google\u306e\u516c\u958b\u30d5\u30a9\u30f3\u30c8\u300cManrope\u300d\u3092\u30db\u30b9\u30c8\u3057\u3066\u3044\u307e\u3059\u3002 <a href=\"https:\/\/fontsource.org\/docs\/getting-started\/introduction\">\u30d5\u30a9\u30f3\u30c8\u30bd\u30fc\u30b9<\/a> \u30d5\u30a9\u30f3\u30c8\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306e\u6700\u3082\u8fc5\u901f\u306a\u65b9\u6cd5\u3092\u8868\u3059\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001\u30c6\u30ad\u30b9\u30c8\u304c HTML \u30d5\u30a1\u30a4\u30eb\u304b\u3089\u53d6\u5f97\u3055\u308c\u3066\u3044\u308b\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u3001\u30d5\u30a9\u30f3\u30c8 \u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u8aad\u307f\u8fbc\u307f\u306b\u9045\u5ef6\u304c\u767a\u751f\u3057\u307e\u3057\u305f\u3002\u30c6\u30ad\u30b9\u30c8\u3068\u30d5\u30a9\u30f3\u30c8\u306e\u8aad\u307f\u8fbc\u307f\u306e\u4e0d\u4e00\u81f4\u3092\u56de\u907f\u3059\u308b\u305f\u3081\u306b\u3001\u5f53\u521d\u306e\u6226\u7565\u3067\u306f\u3001\u512a\u5148 Web \u30d5\u30a9\u30f3\u30c8\u304c\u5b8c\u5168\u306b\u8aad\u307f\u8fbc\u307e\u308c\u308b\u307e\u3067\u3001\u96a0\u308c\u305f\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af \u30d5\u30a9\u30f3\u30c8\u3092\u8868\u793a\u3057\u307e\u3057\u305f\u3002\u3053\u306e\u65b9\u6cd5\u306f\u52b9\u679c\u7684\u3067\u3057\u305f\u304c\u3001LCP \u30e1\u30c8\u30ea\u30c3\u30af\u304c\u9577\u304f\u306a\u3063\u305f\u305f\u3081\u3001\u8fc5\u901f\u306a\u30c6\u30ad\u30b9\u30c8 \u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u512a\u5148\u3057\u3066\u6226\u7565\u3092\u8abf\u6574\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>\u30ef\u30fc\u30af\u30d5\u30ed\u30fc\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002\u307e\u305a\u3001\u30d6\u30e9\u30a6\u30b6\u306f\u6307\u5b9a\u3055\u308c\u305f\u30d5\u30a9\u30f3\u30c8 \u30d5\u30a1\u30df\u30ea\u5185\u3067\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u306a\u30d5\u30a9\u30f3\u30c8\u3092\u8b58\u5225\u3057\u3001\u30c6\u30ad\u30b9\u30c8\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306b\u5c55\u958b\u3057\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001\u5143\u306e\u30d5\u30a9\u30f3\u30c8\u3092\u8aad\u307f\u8fbc\u3080\u3068\u3001\u30d6\u30e9\u30a6\u30b6\u306f\u6700\u521d\u306e\u30d5\u30a9\u30f3\u30c8\u3092\u5fc5\u8981\u306a\u30d5\u30a9\u30f3\u30c8\u306b\u30b7\u30fc\u30e0\u30ec\u30b9\u306b\u7f6e\u304d\u63db\u3048\u307e\u3059\u3002\u3053\u306e\u6226\u7565\u306f\u3001\u30d5\u30a9\u30f3\u30c8 \u30b5\u30a4\u30ba\u306e\u5909\u66f4\u306b\u3088\u308a\u4e88\u671f\u3057\u306a\u3044\u30c6\u30ad\u30b9\u30c8\u306e\u79fb\u52d5\u304c\u767a\u751f\u3059\u308b\u30ea\u30b9\u30af\u306f\u3042\u308b\u3082\u306e\u306e\u3001\u6700\u3082\u9ad8\u901f\u306a\u30d5\u30a9\u30f3\u30c8\u8aad\u307f\u8fbc\u307f\u65b9\u6cd5\u3067\u3059\u3002\u30ec\u30a4\u30a2\u30a6\u30c8 \u30b7\u30d5\u30c8\u3092\u8efd\u6e1b\u3057\u3001\u7d2f\u7a4d\u30ec\u30a4\u30a2\u30a6\u30c8 \u30b7\u30d5\u30c8 (CLS\u3001\u30da\u30fc\u30b8\u8aad\u307f\u8fbc\u307f\u4e2d\u306e\u4e88\u671f\u3057\u306a\u3044\u8981\u7d20\u306e\u79fb\u52d5\u3092\u8ffd\u8de1\u3059\u308b\u305f\u3081\u306e\u30b2\u30fc\u30b8) \u3092\u6539\u826f\u3059\u308b\u305f\u3081\u306b\u3001\u6b21\u306e\u3082\u306e\u3092\u5b9f\u88c5\u3057\u307e\u3057\u305f\u3002 <a href=\"https:\/\/www.w3.org\/TR\/css-fonts-5\/\">CSS \u30d5\u30a9\u30f3\u30c8 \u30e2\u30b8\u30e5\u30fc\u30eb \u30ec\u30d9\u30eb 5<\/a>\u3001\u6b21\u306e\u3088\u3046\u306a\u5c5e\u6027\u3092\u542b\u3080\u4ed5\u69d8\u7fa4 <em>\u30b5\u30a4\u30ba\u8abf\u6574<\/em>, <em>\u964d\u4e0b\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9<\/em>\u3001 \u305d\u3057\u3066 <em>\u884c\u9593\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9<\/em>\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u5909\u66f4\u3092\u56de\u907f\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3057\u305f\u3002<br \/>\n<a href=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F4sf85oqslg70lkwpjfd7.png\"><img decoding=\"async\" src=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F4sf85oqslg70lkwpjfd7.png\" alt=\"\u3055\u307e\u3056\u307e\u306a\u30d5\u30a9\u30f3\u30c8\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u4f7f\u7528\u3057\u3066\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u6642\u9593\u3092\u8868\u793a\u3059\u308b\u56f3\" \/><\/a><br \/>\n<em>CSS\u30d5\u30a9\u30f3\u30c8\u30e2\u30b8\u30e5\u30fc\u30eb\u30ec\u30d9\u30eb5\u306f\u5b8c\u74a7\u306b\u6a5f\u80fd\u3057\u3001\u30ec\u30a4\u30a2\u30a6\u30c8\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u305a\u306b\u30d5\u30a9\u30f3\u30c8\u306e\u5909\u66f4\u3092\u4fdd\u8a3c\u3057\u307e\u3057\u305f\u3002<\/em><\/p>\n<p><strong>\u305d\u306e\u7d50\u679c\u3001First Contentful Paint\u3001Largest Contentful Paint\u3001Cumulative Layout Shift \u306e 3 \u3064\u306e\u6307\u6a19\u304c\u5f37\u5316\u3055\u308c\u307e\u3057\u305f\u3002\u7279\u306b\u3001CLS \u306f 0.143 \u79d2\u304b\u3089 0 \u79d2\u306b\u77ed\u7e2e\u3055\u308c\u307e\u3057\u305f\u3002<\/strong><\/p>\n<h3><a id=\"improving-the-loading-of-images-and-video\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>\u5199\u771f\u3084\u52d5\u753b\u306e\u8aad\u307f\u8fbc\u307f\u306e\u5f37\u5316<\/h3>\n<p>\u79c1\u305f\u3061\u304c\u76f4\u9762\u3057\u305f\u3082\u3046 1 \u3064\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u4e0a\u306e\u8ab2\u984c\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af \u30da\u30a4\u30ed\u30fc\u30c9\u304c\u81a8\u5927\u3060\u3063\u305f\u3053\u3068\u3067\u3059\u3002Web \u30b5\u30a4\u30c8\u306e\u76e3\u67fb\u306b\u3088\u308a\u3001\u54c1\u8cea\u3092\u640d\u306a\u308f\u305a\u306b\u753b\u50cf\u3084\u52d5\u753b\u306e\u30b5\u30a4\u30ba\u3092\u7e2e\u5c0f\u3057\u3066\u3001\u8aad\u307f\u8fbc\u307f\u30d7\u30ed\u30bb\u30b9\u3092\u52b9\u7387\u5316\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u3002<br \/>\n<a href=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fxwm6p0b4vn1knuo68g57.png\"><img decoding=\"async\" src=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fxwm6p0b4vn1knuo68g57.png\" alt=\"\u3055\u307e\u3056\u307e\u306a\u30d5\u30a1\u30a4\u30eb\u306e\u7a2e\u985e\u3092\u793a\u3059\u56f3\" \/><\/a><br \/>\n<em><a href=\"https:\/\/yellowlab.tools\/\">\u30a4\u30a8\u30ed\u30fc\u30e9\u30dc\u30c4\u30fc\u30eb<\/a> \u8a55\u4fa1\u306b\u3088\u308b\u3068\u3001\u3059\u3079\u3066\u306e\u30d5\u30a1\u30a4\u30eb\u5f62\u5f0f\u306e\u4e2d\u3067\u3001\u52d5\u753b\u3068\u753b\u50cf\u306f\u5f53\u793e\u306e\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306b\u5927\u304d\u306a\u8ca0\u62c5\u3092\u304b\u3051\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u3002<\/em><\/p>\n<p>\u5f53\u793e\u306e Web \u30b5\u30a4\u30c8\u306f\u3001\u30d9\u30af\u30bf\u30fc\u753b\u50cf (Scalable Vector Graphics (SVG) \u5f62\u5f0f) \u3068\u30e9\u30b9\u30bf\u30fc\u753b\u50cf (PNG \u304a\u3088\u3073 JPG \u5f62\u5f0f) \u306e 2 \u3064\u306e\u753b\u50cf\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u3067\u69cb\u6210\u3055\u308c\u3066\u3044\u307e\u3059\u3002category \u3054\u3068\u306b\u7570\u306a\u308b\u6700\u9069\u5316\u624b\u6cd5\u304c\u63a1\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h4><a id=\"31-optimization-of-vector-images-3-1-optimization-of-vector-images\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a><a href=\"#31-optimization-of-vector-images\"><\/a>3.1 \u30d9\u30af\u30bf\u30fc\u753b\u50cf\u306e\u5f37\u5316<\/h4>\n<p>\u30d9\u30af\u30bf\u30fc\u753b\u50cf\u306f\u4e00\u822c\u7684\u306b\u8efd\u91cf\u3067\u3059\u304c\u3001\u5404\u753b\u50cf\u3092\u8aad\u307f\u8fbc\u3080\u305f\u3081\u306b\u65b0\u3057\u3044HTTP\u30ea\u30af\u30a8\u30b9\u30c8\u304c\u5fc5\u8981\u306b\u306a\u308a\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u4f4e\u4e0b\u3059\u308b\u3068\u3044\u3046\u554f\u984c\u304c\u6d6e\u4e0a\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u306b\u5bfe\u51e6\u3059\u308b\u305f\u3081\u306b\u3001\u30a4\u30f3\u30e9\u30a4\u30f3SVG\u3092\u63a1\u7528\u3057\u3001\u753b\u50cf\u3092HTML\u306b\u76f4\u63a5\u57cb\u3081\u8fbc\u3080\u3053\u3068\u3092\u9078\u629e\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u306f\u3001 <a href=\"https:\/\/www.gatsbyjs.com\/plugins\/gatsby-plugin-react-svg\/\"> &#039;gatsby-plugin-react-svg&#039; <\/a>\u30d7\u30ed\u30bb\u30b9\u3092\u52b9\u7387\u5316\u3059\u308b Gatsby \u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u5185\u306e\u30d7\u30e9\u30b0\u30a4\u30f3\u3067\u3059\u3002<\/p>\n<h4><a id=\"32-optimization-of-raster-images-3-2-enhancement-of-raster-images\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a><a href=\"#32-optimization-of-raster-images\"><\/a>3.2 \u30e9\u30b9\u30bf\u30fc\u753b\u50cf\u306e\u5f37\u5316 <\/h4>\n<p>PNG \u304a\u3088\u3073 JPG \u753b\u50cf\u306e\u8aad\u307f\u8fbc\u307f\u3092\u9ad8\u901f\u5316\u3059\u308b\u305f\u3081\u306b\u3001\u3053\u308c\u3089\u306e\u753b\u50cf\u3092\u6700\u65b0\u306e .webP \u5f62\u5f0f\u306b\u79fb\u884c\u3057\u3001\u54c1\u8cea\u306e\u4f4e\u4e0b\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u306a\u304c\u3089\u512a\u308c\u305f\u5727\u7e2e\u3092\u5b9f\u73fe\u3057\u307e\u3057\u305f\u3002\u540c\u69d8\u306b\u3001\u30d3\u30c7\u30aa\u3092 .mp4 \u304b\u3089 .webM \u306b\u5909\u63db\u3057\u3001\u5727\u7e2e\u3068\u54c1\u8cea\u306e\u5411\u4e0a\u3092\u5b9f\u73fe\u3057\u307e\u3057\u305f\u3002.webP \u304a\u3088\u3073 .webM \u304c\u4e3b\u8981\u5f62\u5f0f\u3068\u3057\u3066\u63a1\u7528\u3055\u308c\u307e\u3057\u305f\u304c\u3001\u53e4\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u306e\u30d6\u30e9\u30a6\u30b6\u3068\u306e\u4e92\u63db\u6027\u306e\u554f\u984c\u304c\u4e88\u60f3\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u554f\u984c\u3092\u8efd\u6e1b\u3059\u308b\u305f\u3081\u306b\u3001.webP \u304a\u3088\u3073 .webM \u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u306a\u3044\u30d6\u30e9\u30a6\u30b6\u5411\u3051\u306b\u3001.png\u3001.jpg\u3001.mp4 \u5f62\u5f0f\u3078\u306e\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u304c\u7dad\u6301\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001\u753b\u50cf\u306e\u8868\u793a\u306b\u306f\u3055\u307e\u3056\u307e\u306a\u30c7\u30d0\u30a4\u30b9\u3067\u306e\u6700\u9069\u5316\u304c\u5fc5\u8981\u3067\u3057\u305f\u3002\u30e2\u30d0\u30a4\u30eb\u3001\u30bf\u30d6\u30ec\u30c3\u30c8\u3001\u30e9\u30c3\u30d7\u30c8\u30c3\u30d7\u30014K\u30e2\u30cb\u30bf\u30fc\u306a\u3069\u3001\u3055\u307e\u3056\u307e\u306a\u30c7\u30d0\u30a4\u30b9\u3067\u306f\u7570\u306a\u308b\u753b\u50cf\u30b5\u30a4\u30ba\u304c\u6c42\u3081\u3089\u308c\u307e\u3057\u305f\u3002\u30e2\u30d0\u30a4\u30eb\u30684K\u30e2\u30cb\u30bf\u30fc\u306e\u4e21\u65b9\u306b\u540c\u3058\u753b\u50cf\u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u3068\u3001Web\u30b5\u30a4\u30c8\u306e\u8aad\u307f\u8fbc\u307f\u6642\u9593\u304c\u9577\u304f\u306a\u308a\u307e\u3059\u3002\u5bfe\u7b56\u3068\u3057\u3066\u3001\u30a2\u30c0\u30d7\u30c6\u30a3\u30d6\u30b0\u30e9\u30d5\u30a3\u30c3\u30af\u30b9\u3092\u5b9f\u88c5\u3057\u3001\u30b3\u30fc\u30c9\u306b\u3055\u307e\u3056\u307e\u306a\u753b\u50cf\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u57cb\u3081\u8fbc\u3093\u3067\u3001\u30d6\u30e9\u30a6\u30b6\u304c\u30a6\u30a3\u30f3\u30c9\u30a6\u30b5\u30a4\u30ba\u3001\u753b\u9762\u89e3\u50cf\u5ea6\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u901f\u5ea6\u306a\u3069\u306e\u8981\u7d20\u306b\u57fa\u3065\u3044\u3066\u6700\u9069\u306a\u753b\u50cf\u3092\u9078\u629e\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u305f\u3002 <a href=\"https:\/\/www.gatsbyjs.com\/plugins\/gatsby-background-image\/\"> &#039;\u30ae\u30e3\u30c4\u30d3\u30fc\u80cc\u666f\u753b\u50cf&#039; <\/a> \u305d\u3057\u3066 <a href=\"https:\/\/www.gatsbyjs.com\/plugins\/gatsby-image\/\"> &#039;\u30ae\u30e3\u30c4\u30d3\u30fc\u30a4\u30e1\u30fc\u30b8&#039; <\/a>\u3055\u307e\u3056\u307e\u306a\u30c7\u30d0\u30a4\u30b9\u306b\u5408\u308f\u305b\u3066\u8907\u6570\u306e\u753b\u50cf\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u3092\u4f5c\u6210\u3057\u307e\u3057\u305f\u3002 <a href=\"https:\/\/developer.chrome.com\/docs\/devtools\/network\/\">\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30bf\u30d6<\/a> \u4e0b\u306e\u30b9\u30ca\u30c3\u30d7\u30b7\u30e7\u30c3\u30c8\u3067\u306f\u3001\u30da\u30fc\u30b8\u8868\u793a\u30e2\u30fc\u30c9\u3092\u5207\u308a\u66ff\u3048\u308b\u5834\u6240\u306b\u300c\u30c7\u30d0\u30a4\u30b9 \u30c4\u30fc\u30eb\u30d0\u30fc\u306e\u5207\u308a\u66ff\u3048\u300d\u304c\u8868\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<br \/>\n<a href=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fwqgndx0o5ewcz73vdhn1.png\"><img decoding=\"async\" src=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fwqgndx0o5ewcz73vdhn1.png\" alt=\"\u30c7\u30d0\u30a4\u30b9\u30c4\u30fc\u30eb\u30d0\u30fc\" \/><\/a><br \/>\n<em>\u3053\u3053\u3067\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u30c7\u30d0\u30a4\u30b9\u3067\u753b\u50cf\u306e\u8aad\u307f\u8fbc\u307f\u3092\u6539\u826f\u3059\u308b\u305f\u3081\u306b\u30c7\u30d0\u30a4\u30b9\u30c4\u30fc\u30eb\u30d0\u30fc\u3092\u6709\u52b9\u306b\u3057\u307e\u3057\u305f\u3002<\/em><br \/>\n<a href=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F3vay7wymdda5jsalwm3o.png\"><img decoding=\"async\" src=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F3vay7wymdda5jsalwm3o.png\" alt=\"\u540c\u3058\u30d5\u30a1\u30a4\u30eb\u306e\u8aad\u307f\u8fbc\u307f\u30d7\u30ed\u30bb\u30b9\u3092\u7e2e\u5c0f\u3057\u3066\u6700\u9069\u5316\" \/><\/a><br \/>\n<em>\u3053\u3053\u3067\u8868\u793a\u3055\u308c\u3066\u3044\u308b\u306e\u306f\u3001\u30b5\u30a4\u30ba\u3092\u7e2e\u5c0f\u3057\u3066\u3055\u307e\u3056\u307e\u306a\u30c7\u30d0\u30a4\u30b9\u5411\u3051\u306b\u6700\u9069\u5316\u3055\u308c\u305f\u540c\u3058\u30d5\u30a1\u30a4\u30eb\u3067\u3059\u3002<\/em><\/p>\n<h4><a id=\"33-lazy-loading-for-behindthescenes-images-3-3-lazy-loading-for-background-images\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a><a href=\"#33-lazy-loading-for-behindthescenes-images\"><\/a>3.3 \u821e\u53f0\u88cf\u753b\u50cf\u306e\u9045\u5ef6\u8aad\u307f\u8fbc\u307f<\/h4>\n<p>\u6700\u5f8c\u306b\u3001\u307c\u304b\u3057\u753b\u50cf\u52b9\u679c\u3068\u7d44\u307f\u5408\u308f\u305b\u305f\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u3092\u5b9f\u88c5\u3057\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u95b2\u89a7\u3057\u305f\u5834\u5408\u306b\u306e\u307f\u753b\u50cf\u304c\u8aad\u307f\u8fbc\u307e\u308c\u308b\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u3067\u3001\u9650\u3089\u308c\u305f\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\u3092\u8c4a\u304b\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u6599\u91d1\u8868\u3084\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u63a5\u7d9a\u306e\u9045\u3055\u306a\u3069\u3002<br \/>\n<a href=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fboek61ri3wkz9q7xzadf.png\"><img decoding=\"async\" src=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fboek61ri3wkz9q7xzadf.png\" alt=\"\u30d3\u30b8\u30e5\u30a2\u30eb\u306e\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u306e\u4ed5\u7d44\u307f\" \/><\/a><br \/>\n<em>\u3053\u308c\u306f\u3001\u30d3\u30b8\u30e5\u30a2\u30eb\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u6a5f\u80fd\u304c\u3069\u306e\u3088\u3046\u306b\u52d5\u4f5c\u3059\u308b\u304b\u306e\u4f8b\u3067\u3059\u3002<\/em><\/p>\n<p>\u61f8\u547d\u306a\u52aa\u529b\u304c\u5831\u308f\u308c\u3001\u54c1\u8cea\u3092\u640d\u306a\u3046\u3053\u3068\u306a\u304f\u3001Web \u30b5\u30a4\u30c8\u4e0a\u306e\u753b\u50cf\u306e\u30b5\u30a4\u30ba\u3092\u5927\u5e45\u306b\u7e2e\u5c0f\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n<p><a href=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F7ikwaoooeepq81fmvnch.png\"><img decoding=\"async\" src=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F7ikwaoooeepq81fmvnch.png\" alt=\"Yellow Lab Tools \u306e\u30b9\u30b1\u30c3\u30c1\" \/><\/a><br \/>\n<em>\u6539\u5584\u5f8c\u3001Yellow Lab Tools \u306f\u3001\u4e88\u60f3\u901a\u308a\u3001\u52d5\u753b\u304c\u4f9d\u7136\u3068\u3057\u3066\u30da\u30fc\u30b8\u306e\u5927\u304d\u306a\u90e8\u5206\u3092\u5360\u3081\u3066\u3044\u308b\u3082\u306e\u306e\u3001\u30d3\u30b8\u30e5\u30a2\u30eb\u306e\u8ca0\u8377\u306f\u5927\u5e45\u306b\u8efd\u6e1b\u3055\u308c\u305f\u3053\u3068\u3092\u660e\u3089\u304b\u306b\u3057\u307e\u3057\u305f (\u7d2b\u8272\u306e\u90e8\u5206)<\/em><\/p>\n<p><strong>\u6a5f\u80fd\u5f37\u5316\u306b\u3088\u308a\u3001\u30e6\u30fc\u30b6\u30fc \u30a8\u30af\u30b9\u30da\u30ea\u30a8\u30f3\u30b9\u3068 CLS \u3084 LCP \u306a\u3069\u306e\u30b2\u30fc\u30b8\u304c\u5927\u5e45\u306b\u5f37\u5316\u3055\u308c\u307e\u3057\u305f\u3002Gatsby \u30a8\u30b3\u30b7\u30b9\u30c6\u30e0\u5185\u306e\u30d3\u30b8\u30e5\u30a2\u30eb\u6700\u9069\u5316\u62e1\u5f35\u6a5f\u80fd\u306e\u307f\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5411\u4e0a\u3055\u305b\u308b\u30d7\u30ed\u30bb\u30b9\u304c\u5bb9\u6613\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/strong><\/p>\n<h3><a id=\"4-optimizing-caching\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>4. \u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u5408\u7406\u5316<\/h3>\n<p>\u30a6\u30a7\u30d6\u30b5\u30fc\u30d0\u30fc\u304c\u30a6\u30a7\u30d6\u30da\u30fc\u30b8\u306e\u8907\u88fd\u3092\u4fdd\u5b58\u3059\u308b\u65b9\u6cd5\u3067\u3042\u308b\u30ad\u30e3\u30c3\u30b7\u30e5\u306f\u3001\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u4f5c\u6210\u6642\u306b\u5f53\u521d\u306f\u8003\u616e\u3055\u308c\u3066\u3044\u306a\u304b\u3063\u305f\u3053\u3068\u3092\u8a8d\u3081\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u52b9\u679c\u7684\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u306f\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u3092\u9ad8\u901f\u5316\u3057\u3001\u30b5\u30fc\u30d0\u30fc\u306e\u8ca0\u8377\u3092\u8efd\u6e1b\u3067\u304d\u308b\u305f\u3081\u3001\u3053\u308c\u306f\u9593\u9055\u3044\u306a\u304f\u898b\u9003\u3055\u308c\u305f\u53ef\u80fd\u6027\u3067\u3057\u305f\u3002\u79c1\u305f\u3061\u306f\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u6700\u9069\u5316\u306b\u8ffd\u3044\u3064\u304f\u3053\u3068\u3092\u6c7a\u610f\u3057\u307e\u3057\u305f\u304c\u3001\u3055\u307e\u3056\u307e\u306a\u7279\u5b9a\u306e\u969c\u5bb3\u306b\u906d\u9047\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u79c1\u305f\u3061\u306e\u76ee\u6a19\u306f\u3001\u30ea\u30bd\u30fc\u30b9\u3092\u6bce\u56de\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u6b21\u56de\u306e\u8a2a\u554f\u306b\u5099\u3048\u3066\u4fdd\u5b58\u3057\u3066\u304a\u304f\u3053\u3068\u3067\u3001\u30ea\u30bd\u30fc\u30b9\u306e\u8aad\u307f\u8fbc\u307f\u3092\u9ad8\u901f\u5316\u3059\u308b\u3053\u3068\u3067\u3057\u305f\u3002\u3053\u308c\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306b\u3001HTTP \u30d8\u30c3\u30c0\u30fc\u3067\u300ccache-control\u300d\u5c5e\u6027\u3092\u4f7f\u7528\u3057\u3001\u30d5\u30a1\u30a4\u30eb\u304c\u30ad\u30e3\u30c3\u30b7\u30e5\u5185\u306b\u4fdd\u6301\u3055\u308c\u308b\u671f\u9593\u3092\u8a2d\u5b9a\u3057\u307e\u3057\u305f\u3002\u3057\u304b\u3057\u3001\u5225\u306e\u554f\u984c\u304c\u6d6e\u4e0a\u3057\u307e\u3057\u305f\u3002Web \u30b5\u30a4\u30c8\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u3084\u30c7\u30b6\u30a4\u30f3\u306b\u5909\u66f4\u3092\u52a0\u3048\u3066\u3082\u3001\u30d6\u30e9\u30a6\u30b6\u304c\u53e4\u3044\u4fdd\u5b58\u30b3\u30d4\u30fc\u3092\u4f7f\u3044\u7d9a\u3051\u308b\u305f\u3081\u3001\u5909\u66f4\u304c\u3059\u3050\u306b\u306f\u53cd\u6620\u3055\u308c\u307e\u305b\u3093\u3067\u3057\u305f\u3002<\/p>\n<p>\u3069\u306e\u3088\u3046\u306b\u5bfe\u51e6\u3057\u305f\u306e\u3067\u3057\u3087\u3046\u304b? \u30d5\u30a1\u30a4\u30eb\u306e\u540d\u79f0\u306b\u30cf\u30c3\u30b7\u30e5\u3092\u8ffd\u52a0\u3057\u3001\u30d5\u30a1\u30a4\u30eb\u306e\u7de8\u96c6\u3054\u3068\u306b\u66f4\u65b0\u3057\u307e\u3057\u305f\u3002\u3053\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u306b\u3088\u308a\u3001\u5909\u66f4\u3092\u7c21\u5358\u306b\u884c\u3044\u306a\u304c\u3089\u3001\u9577\u671f\u9593\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u30d5\u30a1\u30a4\u30eb\u3092\u4fdd\u5b58\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002\u305d\u306e\u7d50\u679c\u3001First Contentful Paint (FCP) \u30e1\u30c8\u30ea\u30c3\u30af\u304c\u9ad8\u304b\u3089\u4e2d\u7a0b\u5ea6\u306b\u79fb\u884c\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u73fe\u5728\u3001\u79c1\u305f\u3061\u306f\u30d6\u30e9\u30a6\u30b6 \u30ad\u30e3\u30c3\u30b7\u30e5\u3068\u547c\u3070\u308c\u308b\u5225\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u5f62\u5f0f\u3092\u691c\u8a0e\u3057\u3066\u3044\u307e\u3059\u3002\u30b5\u30fc\u30d0\u30fc \u30ad\u30e3\u30c3\u30b7\u30e5\u306f\u6c38\u7d9a\u7684\u306a\u30b5\u30fc\u30d0\u30fc\u63a5\u7d9a\u3092\u5fc5\u8981\u3068\u3057\u3001\u5fdc\u7b54\u3092\u8aad\u307f\u8fbc\u3080\u305f\u3081\u306b\u5e2f\u57df\u5e45\u3092\u6d88\u8cbb\u3057\u307e\u3059\u304c\u3001\u30d6\u30e9\u30a6\u30b6 \u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30e6\u30fc\u30b6\u30fc\u306f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u63a5\u7d9a\u306a\u3057\u3067 Web \u30da\u30fc\u30b8\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u5236\u7d04\u3082\u3042\u308a\u307e\u3059\u3002\u30e6\u30fc\u30b6\u30fc\u306e\u30c7\u30d0\u30a4\u30b9\u306e\u30b9\u30c8\u30ec\u30fc\u30b8\u5bb9\u91cf\u304c\u4e0d\u8db3\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u30d6\u30e9\u30a6\u30b6\u306f\u65b0\u3057\u3044\u30b3\u30f3\u30c6\u30f3\u30c4\u306b\u5bfe\u5fdc\u3059\u308b\u305f\u3081\u306b\u53e4\u3044\u30c7\u30fc\u30bf\u3092\u6d88\u53bb\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\n<a href=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F5rvpshlh4pre29g1vria.png\"><img decoding=\"async\" src=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F5rvpshlh4pre29g1vria.png\" alt=\"\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u52d5\u4f5c\" \/><\/a><br \/>\n<em>\u3088\u308a\u7406\u89e3\u3092\u6df1\u3081\u308b\u305f\u3081\u306b\u3001\u30b5\u30fc\u30d0\u30fc\u5074\u30ad\u30e3\u30c3\u30b7\u30e5\u3068\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u5074\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u3069\u306e\u3088\u3046\u306b\u6a5f\u80fd\u3059\u308b\u304b\u3092\u4e26\u3079\u3066\u307f\u307e\u3059\u3002<\/em><\/p>\n<h3><a id=\"5-eliminating-large-javascript-bundles\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>5. \u5927\u91cf\u306eJavaScript\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u524a\u9664<\/h3>\n<p>\u30d0\u30f3\u30c9\u30eb\u306f\u57fa\u672c\u7684\u306b\u3001JavaScript\u3001CSS\u3001\u305d\u306e\u4ed6\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306a\u3069\u306e\u30d5\u30a1\u30a4\u30eb\u3067\u69cb\u6210\u3055\u308c\u3001\u3088\u308a\u52b9\u679c\u7684\u306a\u914d\u5e03\u306e\u305f\u3081\u306b 1 \u3064\u306e\u30d5\u30a1\u30a4\u30eb\u306b\u7d71\u5408\u3055\u308c\u307e\u3059\u3002Web \u30b5\u30a4\u30c8\u306e\u8907\u96d1\u3055\u304c\u5897\u3059\u306b\u3064\u308c\u3066\u3001\u30d0\u30f3\u30c9\u30eb\u306e\u30b5\u30a4\u30ba\u304c\u5e38\u306b\u5927\u304d\u304f\u306a\u308a\u3001Web \u30b5\u30a4\u30c8\u306e\u91cd\u91cf\u304c\u91cd\u304f\u306a\u308a\u307e\u3057\u305f\u3002\u554f\u984c\u306e\u3042\u308b\u30bb\u30b0\u30e1\u30f3\u30c8\u3092\u7279\u5b9a\u3057\u3066\u524a\u9664\u3059\u308b\u306e\u306b\u9069\u5207\u306a\u6642\u671f\u3067\u3057\u305f\u3002<\/p>\n<p>\u554f\u984c\u306e\u3042\u308b\u30d0\u30f3\u30c9\u30eb\u3092\u8a8d\u8b58\u3057\u3066\u4fee\u6b63\u3059\u308b\u305f\u3081\u306e\u4fbf\u5229\u306a\u30c4\u30fc\u30eb\u304c\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u3046\u3061\u306e1\u3064\u306f\u3001 <a href=\"https:\/\/bundlephobia.com\/\">\u675f\u611f\u6050\u6016\u75c7<\/a>\u306f\u3001NPM \u30d1\u30c3\u30b1\u30fc\u30b8\u304c\u30d0\u30f3\u30c9\u30eb 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href=\"https:\/\/github.com\/wix\/import-cost\">\u8f38\u5165\u30b3\u30b9\u30c8<\/a>VSCode\u62e1\u5f35\u6a5f\u80fd\u3067\u3042\u308b\u306f\u3001\u30a4\u30f3\u30dd\u30fc\u30c8\u3055\u308c\u305f\u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u300c\u30b3\u30b9\u30c8\u300d\u3092\u8a08\u7b97\u3057\u3001\u5341\u5206\u306a\u60c5\u5831\u306b\u57fa\u3065\u3044\u305f\u6c7a\u5b9a\u3092\u4e0b\u3059\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002\u6700\u9069\u5316\u6226\u7565\u306e\u4e00\u74b0\u3068\u3057\u3066\u3001\u5e83\u304f\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u300cclassnames\u300d\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u3088\u308a\u52b9\u7387\u7684\u306a\u3082\u306e\u306b\u7f6e\u304d\u63db\u3048\u308b\u306a\u3069\u3001\u91cd\u3044JS\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u7f6e\u304d\u63db\u3048\u307e\u3057\u305f\u3002 <a href=\"https:\/\/github.com\/lukeed\/clsx\/tree\/4c9a55df075eb96d968e09e56cfa3ba57a5bbdca\/bench\">&#039;clsx&#039;<\/a>\u3001\u5f53\u793e\u306e\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u8981\u4ef6\u306b\u5408\u308f\u305b\u3066\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3055\u308c\u305f\u3001\u3088\u308a\u9ad8\u901f\u3067\u5c0f\u578b\u306e\u30c9\u30ed\u30c3\u30d7\u30a4\u30f3\u4ee3\u66ff\u54c1\u3067\u3059\u3002<\/p>\n<p>\u305d\u306e\u5f8c\u3001 <a href=\"https:\/\/github.com\/webpack-contrib\/webpack-bundle-analyzer\">Webpack \u30d0\u30f3\u30c9\u30eb \u30a2\u30ca\u30e9\u30a4\u30b6\u30fc<\/a> \u30d7\u30e9\u30b0\u30a4\u30f3\u3067\u306f\u3001\u30d0\u30f3\u30c9\u30eb\u5185\u306e\u554f\u984c\u306e\u3042\u308b\u9818\u57df\u3092\u7279\u5b9a\u3057\u307e\u3057\u305f\u3002<br \/>\n<a href=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F1lbpode7xpv2ygopufl0.png\"><img decoding=\"async\" src=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F1lbpode7xpv2ygopufl0.png\" alt=\"\u30d0\u30f3\u30c9\u30eb\u30a2\u30ca\u30e9\u30a4\u30b6\u30fc\u3092\u4f7f\u7528\u3057\u305f\u56f3\" \/><\/a><br \/>\n<em>\u30d0\u30f3\u30c9\u30eb\u30a2\u30ca\u30e9\u30a4\u30b6\u30fc\u306f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u4f4d\u7f6e\u60c5\u5831\u3068\u70b9\u6ec5\u3059\u308b\u30c9\u30c3\u30c8\u306e\u4ed8\u3044\u305f\u5730\u56f3\u3068\u3044\u3046\u6700\u3082\u91cd\u8981\u306a\u30d0\u30f3\u30c9\u30eb\u3092\u767a\u8868\u3057\u307e\u3057\u305f\u3002<\/em><\/p>\n<p>\u3053\u308c\u3089\u306e\u30d5\u30a1\u30a4\u30eb\u306e\u96c6\u5408\u4f53\u3092\u5206\u6790\u3059\u308b\u305f\u3081\u306b\u3001\u30b3\u30fc\u30c9\u5206\u5272\u3068\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u3092\u5229\u7528\u3057\u3066\u3001\u5927\u304d\u306a\u30d0\u30f3\u30c9\u30eb\u3092\u5c0f\u3055\u306a\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u5206\u5272\u3057\u307e\u3057\u305f\u3002Webpack \u306e\u7d71\u5408\u3055\u308c\u305f\u30b3\u30fc\u30c9\u5206\u5272\u6a5f\u80fd\u306b\u3088\u308a\u3001\u30a4\u30f3\u30dd\u30fc\u30c8 \u30b3\u30de\u30f3\u30c9\u3092\u3001\u30d5\u30a1\u30a4\u30eb\u3092\u76f4\u63a5\u30a4\u30f3\u30dd\u30fc\u30c8\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u30d5\u30a1\u30a4\u30eb \u30d1\u30b9\u306b\u8a98\u5c0e\u3059\u308b\u95a2\u6570\u306b\u5909\u66f4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30d5\u30a1\u30a4\u30eb\u304c\u8aad\u307f\u8fbc\u307e\u308c\u308b\u3068\u3044\u3046\u8a93\u7d04\u306b\u4f3c\u305f\u7d04\u675f\u304c\u751f\u6210\u3055\u308c\u307e\u3059\u3002\u30b3\u30fc\u30c9\u5185\u306b\u540c\u69d8\u306e\u69cb\u9020\u304c\u73fe\u308c\u308b\u3068\u3001\u3053\u306e\u7d04\u675f\u304c\u5b88\u3089\u308c\u3001\u30d5\u30a1\u30a4\u30eb\u304c\u8aad\u307f\u8fbc\u307e\u308c\u307e\u3059\u3002<\/p>\n<p>\u5fc5\u9808\u3067\u306f\u306a\u3044\u30d3\u30e5\u30fc\u3001HTML\u3001JS \u306b\u3064\u3044\u3066\u306f\u3001\u52d5\u7684\u30a4\u30f3\u30dd\u30fc\u30c8\u3092\u5229\u7528\u3057\u3066\u3001Web \u30da\u30fc\u30b8\u306e\u521d\u671f\u30b5\u30a4\u30ba\u3092\u7e2e\u5c0f\u3057\u307e\u3057\u305f\u3002\u3053\u3053\u3067\u306e\u300c\u52d5\u7684\u300d\u3068\u306f\u3001Web \u30b5\u30a4\u30c8\u304c\u7279\u5b9a\u306e\u6761\u4ef6\u306b\u57fa\u3065\u3044\u3066\u88dc\u8db3\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u304b\u3069\u3046\u304b\u3092\u6c7a\u5b9a\u3057\u3001\u30e6\u30fc\u30b6\u30fc \u30a8\u30af\u30b9\u30da\u30ea\u30a8\u30f3\u30b9\u3092\u59a8\u3052\u306a\u3044\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<br \/>\n<a href=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Frcs4cfrvufem6ntqjes6.png\"><img decoding=\"async\" src=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Frcs4cfrvufem6ntqjes6.png\" alt=\"\u30d0\u30f3\u30c9\u30eb\u30a2\u30ca\u30e9\u30a4\u30b6\u30fc\u3092\u4f7f\u7528\u3057\u305f\u56f3\" \/><\/a><br \/>\n<em>\u3053\u308c\u304c\u79c1\u305f\u3061\u306e\u6700\u9069\u5316\u306e\u7d50\u679c\u3067\u3059\u3002\u5b64\u7acb\u3057\u305f\u5927\u898f\u6a21\u306a\u30d0\u30f3\u30c9\u30eb\u306e\u306a\u3044\u6d17\u7df4\u3055\u308c\u305f\u8aad\u307f\u8fbc\u307f\u30d7\u30ed\u30bb\u30b9\u3067\u3059\u3002<\/em><\/p>\n<p><strong>\u5927\u304d\u306a\u30d0\u30f3\u30c9\u30eb\u3092\u5c0f\u3055\u306a\u30bb\u30b0\u30e1\u30f3\u30c8\u306b\u5206\u5272\u3057\u305f\u5f8c\u3001\u30da\u30fc\u30b8\u3092\u52b9\u679c\u7684\u306b\u8efd\u91cf\u5316\u3057\u3001\u3059\u3079\u3066\u306e\u5927\u898f\u6a21\u306a\u30d5\u30a1\u30a4\u30eb \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u524a\u9664\u3057\u307e\u3057\u305f\u3002<\/strong><\/p>\n<h3><a id=\"6-minimizing-html-and-css-with-code-compression\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>6. \u30b3\u30fc\u30c9\u5727\u7e2e\u306b\u3088\u308bHTML\u3068CSS\u306e\u5727\u7e2e<\/h3>\n<p>\u30b3\u30fc\u30c9\u5727\u7e2e\u306f\u3001\u79c1\u305f\u3061\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u306b\u9769\u547d\u3092\u3082\u305f\u3089\u3057\u307e\u3057\u305f\u3002\u30b3\u30fc\u30c9\u3092\u5727\u7e2e\u3057\u3001\u4e0d\u8981\u306a\u30b9\u30da\u30fc\u30b9\u3092\u7701\u304f\u3053\u3068\u3067\u3001\u30d5\u30a1\u30a4\u30eb \u30b5\u30a4\u30ba\u306e\u7e2e\u5c0f\u3001\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u306e\u8fc5\u901f\u5316\u3001\u5e2f\u57df\u5e45\u306e\u4f7f\u7528\u91cf\u306e\u6700\u5c0f\u5316\u3092\u5b9f\u73fe\u3057\u307e\u3057\u305f\u3002\u73fe\u5728\u3001\u79c1\u305f\u3061\u306e\u30b5\u30fc\u30d0\u30fc\u306f\u3001\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8 \u30d5\u30a1\u30a4\u30eb\u3092 gzip \u5f62\u5f0f\u3067\u914d\u5e03\u3057\u3066\u304a\u308a\u3001\u901f\u5ea6\u304c\u5411\u4e0a\u3057\u3001FCP \u3084 FID (\u6700\u521d\u306e\u30af\u30ea\u30c3\u30af\u304b\u3089\u30d6\u30e9\u30a6\u30b6\u30fc\u306e\u5fdc\u7b54\u307e\u3067\u306e\u9045\u5ef6\u3092\u6e2c\u5b9a\u3059\u308b\u6307\u6a19\u3067\u3042\u308b First Input Delay) \u306a\u3069\u306e\u91cd\u8981\u306a\u6307\u6a19\u304c\u3001\u6e96\u6700\u9069\u304b\u3089\u4e2d\u7a0b\u5ea6\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9 \u30ec\u30d9\u30eb\u306b\u5927\u5e45\u306b\u5411\u4e0a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3><a id=\"7-code-quality-and-memory-leaks\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>7. \u30b3\u30fc\u30c9\u54c1\u8cea\u306e\u5411\u4e0a\u3068\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306e\u89e3\u6c7a<\/h3>\n<p>\u8a73\u3057\u304f\u8abf\u67fb\u3057\u3066\u307f\u308b\u3068\u3001\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u5185\u306b\u5de7\u5999\u306a\u30e1\u30e2\u30ea \u30ea\u30fc\u30af\u304c\u3044\u304f\u3064\u304b\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u3002\u3053\u306e\u554f\u984c\u306f\u3001\u4e0d\u8981\u306b\u306a\u3063\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u30e1\u30e2\u30ea\u5185\u306b\u6b8b\u308a\u3001\u74b0\u5883\u304c\u6df7\u96d1\u3057\u3066\u3057\u307e\u3046\u3053\u3068\u306b\u8d77\u56e0\u3057\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n<p>\u3053\u308c\u3092\u4fee\u6b63\u3059\u308b\u305f\u3081\u306b\u30012 \u3064\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u5b9f\u88c5\u3057\u307e\u3057\u305f\u3002\u30a4\u30d9\u30f3\u30c8 \u30ea\u30b9\u30ca\u30fc\u304c 1 \u56de\u3060\u3051\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001{only: true} \u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u3092\u9078\u629e\u3057\u307e\u3057\u305f\u3002\u3053\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u306f\u3001\u30ea\u30b9\u30ca\u30fc\u304c\u30c8\u30ea\u30ac\u30fc\u3055\u308c\u305f\u5f8c\u306b\u81ea\u52d5\u7684\u306b\u524a\u9664\u3055\u308c\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u3001\u30e1\u30e2\u30ea\u95a2\u9023\u306e\u8907\u96d1\u3055\u3092\u8efd\u6e1b\u3057\u307e\u3059\u3002\u3055\u3089\u306b\u3001removeEventListener() \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30a4\u30d9\u30f3\u30c8 \u30ea\u30b9\u30ca\u30fc\u3092\u660e\u793a\u7684\u306b\u524a\u9664\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u305f\u3002\u3053\u306e\u624b\u9806\u306f\u3001\u8981\u7d20\u3092\u524a\u9664\u3059\u308b\u524d\u3001\u307e\u305f\u306f\u30ea\u30b9\u30ca\u30fc\u304c\u53e4\u304f\u306a\u3063\u305f\u5f8c\u306b\u5b9f\u884c\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u3088\u3046\u306a\u30a2\u30af\u30b7\u30e7\u30f3\u306b\u3088\u308a\u3001\u8981\u7d20\u3068\u95a2\u6570\u9593\u306e\u30b7\u30fc\u30e0\u30ec\u30b9\u306a\u5207\u65ad\u304c\u4fc3\u9032\u3055\u308c\u3001\u30e1\u30e2\u30ea \u30ea\u30fc\u30af\u304c\u56de\u907f\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n<p>addEventListener \u306b\u95a2\u3057\u3066\u8003\u616e\u3059\u3079\u304d\u3082\u3046 1 \u3064\u306e\u70b9\u306f\u3001{passive: true} \u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u7d44\u307f\u8fbc\u3080\u3053\u3068\u3067\u3059\u3002\u3053\u306e\u8abf\u6574\u306f\u3001\u30b9\u30af\u30ed\u30fc\u30eb\u64cd\u4f5c\u306b\u6709\u76ca\u3067\u3042\u308a\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u4e2d\u65ad\u3092\u9632\u304e\u3001\u30e6\u30fc\u30b6\u30fc \u30a8\u30af\u30b9\u30da\u30ea\u30a8\u30f3\u30b9\u306e\u5411\u4e0a\u306b\u8ca2\u732e\u3059\u308b\u3053\u3068\u304c\u8a3c\u660e\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><code>   useEffect(() =&gt; { setScrolled(document.documentElement.scrollTop &gt; 50); window.addEventListener(&#039;scroll&#039;, handleScroll, {passive: true }); return () =&gt; { document.body.style.overflowY = &#039;scroll&#039;; window.removeEventListener(&#039;scroll&#039;, handleScroll); }; }, []);   <\/code><\/p>\n<h3><a id=\"before-and-after-how-performance-boost-impacted-our-website\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5411\u4e0a\u304c\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306b\u4e0e\u3048\u308b\u5f71\u97ff<\/h3>\n<p>\u7387\u76f4\u306b\u8a00\u3046\u3068\u3001\u5f53\u521d\u306e\u72b6\u6cc1\u306f\u6700\u9069\u3068\u306f\u8a00\u3048\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u8aad\u307f\u8fbc\u307f\u6642\u9593\u304c\u9045\u304f\u3001\u30b5\u30fc\u30d0\u30fc\u306b\u8ca0\u8377\u304c\u304b\u304b\u308a\u3001\u30e6\u30fc\u30b6\u30fc \u30a8\u30af\u30b9\u30da\u30ea\u30a8\u30f3\u30b9\u304c\u8457\u3057\u304f\u640d\u306a\u308f\u308c\u3066\u3044\u307e\u3057\u305f\u3002\u3057\u304b\u3057\u3001\u8cb4\u91cd\u306a\u6d1e\u5bdf\u3068\u6700\u9069\u5316\u6226\u7565\u3092\u6b66\u5668\u306b\u3001\u79c1\u305f\u3061\u306f\u30bf\u30b9\u30af\u306b\u5c02\u5ff5\u3057\u3001\u7d20\u6674\u3089\u3057\u3044\u6210\u679c\u3092\u4e0a\u3052\u307e\u3057\u305f\u3002\u7d50\u679c\u306b\u6e80\u8db3\u3067\u304d\u305f\u3067\u3057\u3087\u3046\u304b? \u9593\u9055\u3044\u306a\u304f\u6e80\u8db3\u3067\u3059\u3002<\/p>\n<p><a href=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F5iu7vw86tbc88yw8y08d.png\"><img decoding=\"async\" src=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F5iu7vw86tbc88yw8y08d.png\" alt=\"Lighthouse \u30e1\u30c8\u30ea\u30c3\u30af\u306e\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8\" \/><\/a><br \/>\n<em><a href=\"https:\/\/pagespeed.web.dev\/\">\u30da\u30fc\u30b8\u30b9\u30d4\u30fc\u30c9\u30a4\u30f3\u30b5\u30a4\u30c8<\/a> \u5927\u5e45\u306a\u6539\u5584\u70b9\u3092\u5f37\u8abf\u3057\u305f\u8cde\u8cdb\u306b\u5024\u3059\u308b\u6210\u7e3e\u8868\u3092\u63d0\u793a\u3057\u3066\u304f\u308c\u307e\u3057\u305f<\/em><br \/>\n<a href=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fy44umhfi677w90hq2ado.png\"><img decoding=\"async\" src=\"https:\/\/media.dev.to\/cdn-cgi\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fy44umhfi677w90hq2ado.png\" alt=\"Core Web Vitals \u6307\u6a19\u306e\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8\" \/><\/a><br \/>\n<em>1\u304b\u6708\u306b\u308f\u305f\u308b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8a55\u4fa1\u3067\u306f\u3001\u76ee\u899a\u307e\u3057\u3044\u9032\u6b69\u304c\u793a\u3055\u308c\u307e\u3057\u305f\u3002\u3059\u3079\u3066\u306e\u6307\u6a19\u304c\u3001\u5f53\u521d\u306e\u76ee\u6a19\u3068\u6bd4\u8f03\u3057\u3066\u5927\u5e45\u306a\u6539\u5584\u3092\u793a\u3057\u307e\u3057\u305f\u3002<\/em><\/p>\n<p>\u3053\u308c\u3089\u306e\u5909\u9769\u306f\u3001\u6570\u3048\u5207\u308c\u306a\u3044\u307b\u3069\u306e\u6642\u9593\u3068\u65e5\u6570\u3092\u8cbb\u3084\u3057\u305f\u52aa\u529b\u306a\u3057\u306b\u306f\u9054\u6210\u3067\u304d\u306a\u304b\u3063\u305f\u3067\u3057\u3087\u3046\u3002\u3057\u304b\u3057\u3001\u79c1\u305f\u3061\u306e\u6210\u529f\u306b\u5927\u304d\u304f\u8ca2\u732e\u3057\u305f\u3082\u3046 1 \u3064\u306e\u8981\u56e0\u306f\u3001\u9069\u5207\u306a\u30c4\u30fc\u30eb\u306e\u6d3b\u7528\u3067\u3057\u305f\u3002\u7279\u5b9a\u306e\u30c4\u30fc\u30eb\u306f\u3001\u79c1\u305f\u3061\u306e\u53d6\u308a\u7d44\u307f\u306e\u6642\u9593\u3092\u7bc0\u7d04\u3057\u305f\u3060\u3051\u3067\u306a\u304f\u3001\u611f\u8b1d\u306b\u5024\u3059\u308b\u3082\u306e\u3067\u3057\u305f\u3002<\/p>\n<h4><a id=\"tools-for-performance-optimization-pagespeed-insights-and-lighthouse\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5411\u4e0a\u306e\u305f\u3081\u306e\u30c4\u30fc\u30eb: PageSpeed Insights \u3068 Lighthouse<\/h4>\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8a55\u4fa1\u3068\u5f37\u5316\u306e\u5206\u91ce\u3067\u306f\u30012 \u3064\u306e Google \u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u304c\u969b\u7acb\u3063\u3066\u3044\u307e\u3059\u3002 <a href=\"https:\/\/pagespeed.web.dev\/\">\u30da\u30fc\u30b8\u30b9\u30d4\u30fc\u30c9\u30a4\u30f3\u30b5\u30a4\u30c8<\/a> \u305d\u3057\u3066 <a href=\"https:\/\/developer.chrome.com\/docs\/lighthouse\/overview\">\u706f\u53f0<\/a>\u3053\u308c\u3089\u306e\u30c4\u30fc\u30eb\u306f\u3001Web \u30da\u30fc\u30b8\u306e\u3055\u307e\u3056\u307e\u306a\u5074\u9762\u3092\u7cbe\u67fb\u3057\u3066\u3001\u305d\u306e\u901f\u5ea6\u3001\u30e6\u30fc\u30b6\u30fc \u30a8\u30af\u30b9\u30da\u30ea\u30a8\u30f3\u30b9\u3001\u5168\u4f53\u7684\u306a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u95a2\u3059\u308b\u6d1e\u5bdf\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u304c\u7dcf\u5408\u7684\u306b\u8a55\u4fa1\u3059\u308b\u6307\u6a19\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<ul>\n<li><strong>\u6700\u5927\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u30da\u30a4\u30f3\u30c8 (LCP)<\/strong> \u2013 \u8868\u793a\u9818\u57df\u5185\u306e\u6700\u5927\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u8981\u7d20 (\u753b\u50cf\u3084\u30c6\u30ad\u30b9\u30c8 \u30d6\u30ed\u30c3\u30af\u306a\u3069) \u304c\u30e6\u30fc\u30b6\u30fc\u306b\u8868\u793a\u3055\u308c\u308b\u307e\u3067\u306e\u6642\u9593\u3092\u6e2c\u5b9a\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u30d5\u30a1\u30fc\u30b9\u30c8 \u30b3\u30f3\u30c6\u30f3\u30c4 \u30da\u30a4\u30f3\u30c8 (FCP)<\/strong> \u2013 \u30d6\u30e9\u30a6\u30b6\u304c\u30c6\u30ad\u30b9\u30c8\u3084\u753b\u50cf\u306a\u3069\u306e\u6700\u521d\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3059\u308b\u306e\u306b\u304b\u304b\u308b\u6642\u9593\u3092\u6e2c\u5b9a\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u6700\u521d\u306e\u5165\u529b\u9045\u5ef6 (FID)<\/strong> \u2013 \u30e6\u30fc\u30b6\u30fc\u306e\u4e3b\u306a\u64cd\u4f5c (\u30dc\u30bf\u30f3\u306e\u30af\u30ea\u30c3\u30af\u306a\u3069) \u3068\u3001\u305d\u306e\u30a2\u30af\u30b7\u30e7\u30f3\u306b\u5bfe\u3059\u308b\u30d6\u30e9\u30a6\u30b6\u306e\u5fdc\u7b54\u3068\u306e\u9593\u306e\u9045\u5ef6\u3092\u8a55\u4fa1\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u7d2f\u7a4d\u30ec\u30a4\u30a2\u30a6\u30c8\u30b7\u30d5\u30c8 (CLS)<\/strong> \u2013 \u30da\u30fc\u30b8\u306e\u5b58\u7d9a\u671f\u9593\u4e2d\u306b\u767a\u751f\u3057\u305f\u3059\u3079\u3066\u306e\u500b\u5225\u306e\u30ec\u30a4\u30a2\u30a6\u30c8 \u30b7\u30d5\u30c8 \u30b9\u30b3\u30a2\u306e\u5408\u8a08\u3092\u96c6\u8a08\u3057\u307e\u3059\u3002\u30ec\u30a4\u30a2\u30a6\u30c8 \u30b7\u30d5\u30c8\u306f\u3001\u30da\u30fc\u30b8\u4e0a\u306e\u8868\u793a\u8981\u7d20\u304c\u4e88\u671f\u305b\u305a\u79fb\u52d5\u3057\u305f\u3068\u304d\u306b\u767a\u751f\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u6b21\u306e\u30da\u30a4\u30f3\u30c8\u3078\u306e\u30a4\u30f3\u30bf\u30e9\u30af\u30b7\u30e7\u30f3 (INP)<\/strong> \u2013 \u30d6\u30e9\u30a6\u30b6\u304c\u30da\u30fc\u30b8\u4e0a\u306e\u8996\u899a\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u66f4\u65b0\u3057\u3066\u30e6\u30fc\u30b6\u30fc\u306e\u64cd\u4f5c\uff08\u30af\u30ea\u30c3\u30af\u3084\u30bf\u30c3\u30d7\u306a\u3069\uff09\u306b\u53cd\u5fdc\u3059\u308b\u307e\u3067\u306e\u6642\u9593\u3092\u8a08\u7b97\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u6700\u521d\u306e\u30d0\u30a4\u30c8\u307e\u3067\u306e\u6642\u9593 (TTFB)<\/strong> \u2013 \u30ea\u30af\u30a8\u30b9\u30c8\u5f8c\u306b\u30d6\u30e9\u30a6\u30b6\u304c\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u6700\u521d\u306e\u30c7\u30fc\u30bf \u30d0\u30a4\u30c8\u3092\u53d7\u4fe1\u3059\u308b\u307e\u3067\u306e\u671f\u9593\u3092\u6c7a\u5b9a\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u5408\u8a08\u30d6\u30ed\u30c3\u30af\u6642\u9593 (TBT)<\/strong> \u2013 \u30d6\u30e9\u30a6\u30b6\u306e\u30d7\u30e9\u30a4\u30de\u30ea \u30b9\u30ec\u30c3\u30c9\u304c\u59a8\u5bb3\u3055\u308c\u3001\u30e6\u30fc\u30b6\u30fc\u5165\u529b\u306b\u5fdc\u7b54\u3067\u304d\u306a\u3044\u5408\u8a08\u671f\u9593\u3092\u5b9a\u91cf\u5316\u3057\u307e\u3059\u3002<\/li>\n<li><strong>TTI (\u5bfe\u8a71\u6642\u9593)<\/strong> \u2013 \u30da\u30fc\u30b8\u304c\u5b8c\u5168\u306b\u30a4\u30f3\u30bf\u30e9\u30af\u30c6\u30a3\u30d6\u306b\u306a\u308b\u307e\u3067\u306e\u6642\u9593\u3001\u3064\u307e\u308a\u5fc5\u8981\u306a\u30ea\u30bd\u30fc\u30b9\u304c\u3059\u3079\u3066\u8aad\u307f\u8fbc\u307e\u308c\u3001\u30da\u30fc\u30b8\u304c\u30e6\u30fc\u30b6\u30fc\u5165\u529b\u306b\u5373\u5ea7\u306b\u5fdc\u7b54\u3059\u308b\u307e\u3067\u306e\u6642\u9593\u3092\u8a55\u4fa1\u3057\u307e\u3059\u3002<\/li>\n<li><strong>FID (\u6700\u521d\u306e\u5165\u529b\u9045\u5ef6)<\/strong> \u2013 \u30e6\u30fc\u30b6\u30fc\u306e\u6700\u521d\u306e\u30a4\u30f3\u30bf\u30e9\u30af\u30b7\u30e7\u30f3\u3068\u3001\u305d\u306e\u30a4\u30f3\u30bf\u30e9\u30af\u30b7\u30e7\u30f3\u306b\u5bfe\u3059\u308b\u30d6\u30e9\u30a6\u30b6\u306e\u53cd\u5fdc\u3068\u306e\u9593\u306e\u9045\u5ef6\u3092\u7cbe\u67fb\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u3053\u308c\u3089\u306e\u30c4\u30fc\u30eb\u306e\u3044\u305a\u308c\u304b\u3092\u6d3b\u7528\u3057\u3066\u3001Web \u30b5\u30a4\u30c8\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u95a2\u3059\u308b\u6d1e\u5bdf\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002Lighthouse \u306f\u3088\u308a\u67d4\u8edf\u3067\u8a73\u7d30\u306a\u6d1e\u5bdf\u3092\u63d0\u4f9b\u3057\u3001PageSpeed Insights \u306f\u500b\u3005\u306e\u30da\u30fc\u30b8\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u76e3\u8996\u306b\u91cd\u70b9\u3092\u7f6e\u3044\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3089 2 \u3064\u306f\u3088\u304f\u5229\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u5f0a\u793e\u304b\u3089\u306e\u552f\u4e00\u306e\u63a8\u5968\u4e8b\u9805\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u53d6\u308a\u7d44\u307f\u3067\u975e\u5e38\u306b\u5f79\u7acb\u3064\u53ef\u80fd\u6027\u306e\u3042\u308b\u8ffd\u52a0\u306e\u30ea\u30bd\u30fc\u30b9\u3092\u3044\u304f\u3064\u304b\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h4><a id=\"bonus-tools-for-a-deeper-dive\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>\u5305\u62ec\u7684\u306a\u8abf\u67fb\u306e\u305f\u3081\u306e\u88dc\u52a9\u30c4\u30fc\u30eb<\/h4>\n<p><a href=\"https:\/\/gtmetrix.com\/\">GT\u30e1\u30c8\u30ea\u30c3\u30af\u30b9<\/a>: \u30da\u30fc\u30b8\u3092\u76e3\u67fb\u3059\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u8aad\u307f\u8fbc\u307f\u3092\u308f\u304b\u308a\u3084\u3059\u3044\u5f62\u5f0f\u3067\u8996\u899a\u5316\u3057\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u5411\u4e0a\u3092\u5177\u4f53\u7684\u306b\u793a\u3059\u5f37\u529b\u306a\u30c4\u30fc\u30eb\u3067\u3059\u3002<\/p>\n<p><a href=\"https:\/\/yellowlab.tools\/\">\u30a4\u30a8\u30ed\u30fc\u30e9\u30dc\u30c4\u30fc\u30eb<\/a>: \u591a\u6570\u306e\u6307\u6a19\u3092\u5206\u985e\u3057\u3066\u8a55\u4fa1\u3059\u308b\u6d1e\u5bdf\u529b\u306b\u5bcc\u3093\u3060\u30c0\u30c3\u30b7\u30e5\u30dc\u30fc\u30c9\u3002\u554f\u984c\u3092\u7279\u5b9a\u3059\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u6700\u9069\u5316\u306e\u305f\u3081\u306e\u8a73\u7d30\u306a\u63d0\u6848\u3082\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3089\u306e\u30c4\u30fc\u30eb\u306f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u5411\u4e0a\u3068\u512a\u308c\u305f\u30e6\u30fc\u30b6\u30fc \u30a8\u30af\u30b9\u30da\u30ea\u30a8\u30f3\u30b9\u306e\u63d0\u4f9b\u306b\u5f79\u7acb\u3064\u6307\u91dd\u3068\u3057\u3066\u6a5f\u80fd\u3057\u3066\u3044\u307e\u3059\u3002Web \u30b5\u30a4\u30c8\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u5411\u4e0a\u306b\u53d6\u308a\u7d44\u3080\u969b\u306b\u306f\u3001\u3053\u308c\u3089\u306e\u30c4\u30fc\u30eb\u3092\u5ff5\u982d\u306b\u7f6e\u3044\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h4><a id=\"bottom-line\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>\u7d50\u8ad6<\/h4>\n<p>\u30d3\u30b8\u30cd\u30b9\u304c\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306b\u4f9d\u5b58\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u305d\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u7121\u8996\u3059\u308b\u3053\u3068\u306f\u8a31\u3055\u308c\u307e\u305b\u3093\u3002\u3053\u306e\u5074\u9762\u306b\u3088\u308a\u3001Google \u691c\u7d22\u7d50\u679c\u306e\u6700\u524d\u7dda\u306b\u8e8d\u308a\u51fa\u308b\u3053\u3068\u3082\u3001\u9006\u306b\u3001\u3088\u308a\u9ad8\u901f\u3067\u512a\u308c\u305f\u30a8\u30af\u30b9\u30da\u30ea\u30a8\u30f3\u30b9\u3092\u63d0\u4f9b\u3059\u308b\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306b\u30e6\u30fc\u30b6\u30fc\u3092\u79fb\u884c\u3055\u305b\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u7aae\u5730\u3092\u56de\u907f\u3059\u308b\u305f\u3081\u306b\u3001\u79c1\u305f\u3061\u306f\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u5909\u8c8c\u306e\u7269\u8a9e\u3092\u5171\u6709\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u5e38\u306b\u6539\u5584\u306e\u4f59\u5730\u304c\u3042\u308b\u305f\u3081\u3001\u6700\u9069\u306a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u8ffd\u6c42\u3059\u308b\u79c1\u305f\u3061\u306e\u65c5\u306f\u7d9a\u304d\u307e\u3059\u3002\u6700\u8fd1\u3001GatsbyJS \u306b\u3044\u304f\u3064\u304b\u306e\u8ab2\u984c\u304c\u898b\u3089\u308c\u3001NextJS 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