{"id":9115,"date":"2025-09-12T11:55:00","date_gmt":"2025-09-12T02:55:00","guid":{"rendered":"https:\/\/fastcoding.jp\/blog\/?p=9115"},"modified":"2025-09-19T15:00:02","modified_gmt":"2025-09-19T06:00:02","slug":"%e3%82%b5%e3%82%a4%e3%83%88%e3%81%ae%e8%bb%bd%e9%87%8f%e5%8c%96%e3%82%92%e5%9b%b3%e3%82%8b%e3%82%b5%e3%82%b9%e3%83%86%e3%83%8a%e3%83%96%e3%83%abweb","status":"publish","type":"post","link":"https:\/\/fastcoding.jp\/blog\/all\/webdesign\/%e3%82%b5%e3%82%a4%e3%83%88%e3%81%ae%e8%bb%bd%e9%87%8f%e5%8c%96%e3%82%92%e5%9b%b3%e3%82%8b%e3%82%b5%e3%82%b9%e3%83%86%e3%83%8a%e3%83%96%e3%83%abweb\/","title":{"rendered":"\u30b5\u30a4\u30c8\u306e\u8efd\u91cf\u5316\u3092\u56f3\u308b\uff01\u2500 \u30b5\u30b9\u30c6\u30ca\u30d6\u30ebWeb\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u306e\u5b9f\u8df5\u30ce\u30a6\u30cf\u30a6"},"content":{"rendered":"<div class=\"the_content\">\n<h2 class=\"wp-block-heading\">\u3042\u306a\u305f\u306e\u30b5\u30a4\u30c8\u3001\u8efd\u304f\u3067\u304d\u3066\u3044\u307e\u3059\u304b\uff1f<\/h2>\n\n\n\n<p>\u3053\u3093\u306b\u3061\u306f\u3002\u682a\u5f0f\u4f1a\u793e\u30d5\u30a1\u30b9\u30c8\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u306eWeb\u30c7\u30a3\u30ec\u30af\u30bf\u30fc\u3001\u50cd\u304f\u304a\u304b\u3093\u3067\u3059\u3002\u6700\u8fd1\u306fGoogle\u691c\u7d22\u3084Bing\u691c\u7d22\u304b\u3089\u306e\u307f\u306a\u3089\u305a\u3001ChatGPT\u7b49\u306eAI\u3067\u8868\u793a\u3055\u308c\u308b\u304b\u3069\u3046\u304b\u306eAIO\u5bfe\u7b56\u304c\u6ce8\u76ee\u3055\u308c\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<p>AIO\u5bfe\u7b56\u3067\u8a9e\u3089\u308c\u308b\u306e\u306f\u5b9f\u969b\u306b\u306fSEO\u5bfe\u7b56\u3068\u540c\u69d8\u306e\u69cb\u9020\u5316\u30bf\u30b0\u8ffd\u52a0\u3084\u9069\u5207\u306a\u30de\u30fc\u30af\u30a2\u30c3\u30d7\u5236\u4f5c\u306b\u5bc4\u308a\u304c\u3061\u3067\u3059\u304c\u3001\u5b9f\u306f\u8868\u793a\u901f\u5ea6\u3082\u5927\u4e8b\u306a\u3053\u3068\u3092\u3054\u5b58\u3058\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n\n\n\n<p>\u307e\u305f\u30da\u30fc\u30b8\u8868\u793a\u901f\u5ea6\u306fAIO\u3084SEO\u5bfe\u7b56\u3060\u3051\u3067\u306f\u306a\u304f\u3066\u3001Web\u30b5\u30a4\u30c8\u306e\u30e6\u30fc\u30b6\u30d3\u30ea\u30c6\u30a3\u306b\u3082\u76f4\u7d50\u3057\u3001\u6700\u8fd1\u3067\u306f\u300c\u30b5\u30b9\u30c6\u30ca\u30d6\u30ebWeb\u300d\u3068\u547c\u3070\u308c\u308b\u5206\u91ce\u3067\u3082\u91cd\u8996\u3055\u308c\u3066\u3044\u308b\u304a\u8a71\u3067\u3059\u3002\u305d\u3053\u3067\u4eca\u56de\u306f\u30da\u30fc\u30b8\u306e\u8868\u793a\u901f\u5ea6\u3092\u4e2d\u5fc3\u3068\u3057\u305f\u8efd\u91cf\u5316\u306e\u91cd\u8981\u6027\u3068\u305d\u306e\u5b9f\u8df5\u65b9\u6cd5\u306b\u3064\u3044\u3066\u304a\u3001\u300c\u30b5\u30b9\u30c6\u30ca\u30d6\u30ebWeb\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u300d\u3068\u3057\u3066\u304a\u8a71\u3057\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u306a\u305c\u8868\u793a\u901f\u5ea6\u3068\u8efd\u91cf\u5316\u304c\u5927\u4e8b\u306a\u306e\uff1f<\/h2>\n\n\n\n<p>\u30da\u30fc\u30b8\u306e\u8868\u793a\u901f\u5ea6\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\u305d\u306e\u3082\u306e\u306b\u76f4\u7d50\u3057\u307e\u3059\u3002\u8868\u793a\u304c\u9045\u3044\u3068\u3001\u30e6\u30fc\u30b6\u30fc\u306f\u305d\u306e\u30b5\u30a4\u30c8\u3092\u3059\u3050\u306b\u96e2\u308c\u304c\u3061\u3067\u3059\u3002\u3053\u308c\u306f\u300c\u30d0\u30a6\u30f3\u30b9\u7387\u300d\u3068\u3057\u3066\u8a08\u6e2c\u3067\u304d\u307e\u3059\u304c\u3001\u3053\u306e\u6570\u5024\u304c\u9ad8\u307e\u308b\u3068SEO\u306b\u3082\u60aa\u5f71\u97ff\u304c\u53ca\u3073\u307e\u3059\u3002\u901f\u3084\u304b\u306b\u30b5\u30a4\u30c8\u304c\u8868\u793a\u3055\u308c\u308c\u3070\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u60c5\u5831\u3092\u53d6\u5f97\u3057\u3084\u3059\u304f\u306a\u308a\u3001\u4fe1\u983c\u611f\u3092\u4e0e\u3048\u308b\u3053\u3068\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>Google\u3082\u30da\u30fc\u30b8\u306e\u8aad\u307f\u8fbc\u307f\u901f\u5ea6\u3092\u30e9\u30f3\u30ad\u30f3\u30b0\u8981\u56e0\u306e\u4e00\u3064\u3068\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u8aad\u307f\u8fbc\u307f\u304c\u901f\u3044\u30b5\u30a4\u30c8\u306f\u691c\u7d22\u7d50\u679c\u3067\u4e0a\u4f4d\u306b\u8868\u793a\u3055\u308c\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002\u3064\u307e\u308a\u3001Web\u30b5\u30a4\u30c8\u306e\u8efd\u91cf\u5316\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\u3068SEO\u306e\u4e21\u9762\u3067\u6b20\u304b\u305b\u306a\u3044\u8981\u7d20\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u30b5\u30a4\u30c8\u3092\u8efd\u304f\u3059\u308b\u305f\u3081\u306e\u30c6\u30af\u30cb\u30c3\u30af<\/h2>\n\n\n\n<p>\u8868\u793a\u3092\u901f\u304f\u3057\u3066\u201c\u4f53\u611f\u306e\u8efd\u3055\u201d\u3092\u4e0a\u3052\u308b\u306b\u306f\u3001\u30d5\u30ed\u30f3\u30c8\u3068\u914d\u4fe1\u306e\u4e21\u9762\u304b\u3089\u624b\u3092\u6253\u3064\u306e\u304c\u8fd1\u9053\u3067\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u307e\u305a\u5165\u308c\u308b\u3079\u304d\u5b9a\u756a\u306e6\u30c6\u30af\u30cb\u30c3\u30af\u3092\u307e\u3068\u3081\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">1) \u753b\u50cf\u306e\u6700\u9069\u5316\u3068\u914d\u4fe1\uff08WebP\/AVIF\uff0b\u9069\u5207\u30b5\u30a4\u30ba\uff09<\/h3>\n\n\n\n<p><strong>\u8aac\u660e<\/strong><br>\u753b\u50cf\u306fWeb\u30b5\u30a4\u30c8\u306e\u4e2d\u3067\u3082\u6700\u3082\u91cd\u305f\u3044\u30ea\u30bd\u30fc\u30b9\u3067\u3059\u3002\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092 WebP\/AVIF \u306b\u5207\u308a\u66ff\u3048\u3064\u3064\u3001\u30c7\u30d0\u30a4\u30b9\u306b\u5408\u308f\u305b\u3066\u201c\u5fc5\u8981\u306a\u30b5\u30a4\u30ba\u3060\u3051\u201d\u914d\u4fe1\u3059\u308b\u3068\u3001\u8aad\u307f\u8fbc\u307f\u304c\u5927\u304d\u304f\u77ed\u7e2e\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"has-small-font-size\">\u203b\u52d5\u753b\u304c\u4e00\u756a\u91cd\u3044\u3001\u3068\u601d\u3046\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u6700\u8fd1\u306e\u52d5\u753b\u306f\u57fa\u672c\u7684\u306b\u30d7\u30ed\u30b0\u30ec\u30c3\u30b7\u30d6\u914d\u4fe1\uff08\u3061\u3087\u3063\u3068\u305a\u3064\u914d\u4fe1\uff09\u306b\u306a\u308a\u307e\u3059\u306e\u3067\u3001\u5b9f\u306f\u753b\u50cf\u304c\u4e00\u756a\u91cd\u304f\u306a\u308a\u304c\u3061\u3067\u3059\u3002<\/p>\n\n\n\n<p><strong>\u30dd\u30a4\u30f3\u30c8<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5143\u753b\u50cf\u3092\u5727\u7e2e\uff08\u753b\u8cea\u306f80\u524d\u5f8c\u304b\u3089\u691c\u8a0e\uff0f\u5199\u771f\u306fWebP\/AVIF\u3001\u30ed\u30b4\u7b49\u306fSVG\u5f62\u5f0f\u304c\u304a\u3059\u3059\u3081\u3067\u3059\uff09<\/li>\n\n\n\n<li><code>srcset<\/code> \/ <code>sizes<\/code> \u3067<strong>\u904e\u4e0d\u8db3\u306e\u306a\u3044\u89e3\u50cf\u5ea6<\/strong>\u3092\u914d\u308b\uff08srcset\u3084sizes\u3092\u4f7f\u3048\u3070\u3001\u95b2\u89a7\u8005\u306e\u753b\u9762\u306e\u89e3\u50cf\u5ea6\u306b\u5408\u308f\u305b\u305f\u30b5\u30a4\u30ba\u306e\u753b\u50cf\u3092\u914d\u4fe1\u3067\u304d\u307e\u3059\uff09<\/li>\n\n\n\n<li><code>&lt;picture&gt;<\/code>\u3067<strong>\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af<\/strong>\uff08picture\u30bf\u30b0\u3067\u56f2\u3046\u3053\u3068\u3067\u3001\u4e07\u4e00AVIF\u304c\u4f7f\u3048\u306a\u3044\u30d6\u30e9\u30a6\u30b6\u3067\u3082\u3001WebP\u3092\u4f7f\u3046\u3002\u305d\u308c\u304c\u3060\u3081\u3067\u3082JPEG\/PNG\u3001\u3068\u3044\u3046\u98a8\u306b\u3001\u30d0\u30b0\u304c\u51fa\u306a\u3044\u3088\u3046\u306b\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\uff09<\/li>\n<\/ul>\n\n\n\n<p><strong>\u5b9f\u88c5\u4f8b<\/strong><\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: xml; title: ; notranslate\" title=\"\">\n&lt;picture&gt;\n  &lt;source srcset=&quot;\/img\/hero.avif 1x, \/img\/hero@2x.avif 2x&quot; type=&quot;image\/avif&quot;&gt;\n  &lt;source srcset=&quot;\/img\/hero.webp 1x, \/img\/hero@2x.webp 2x&quot; type=&quot;image\/webp&quot;&gt;\n  &lt;img src=&quot;\/img\/hero.jpg&quot;\n       srcset=&quot;\/img\/hero_768.jpg 768w, \/img\/hero_1280.jpg 1280w, \/img\/hero_1600.jpg 1600w&quot;\n       sizes=&quot;(max-width: 768px) 92vw, (max-width: 1280px) 80vw, 1200px&quot;\n       width=&quot;1600&quot; height=&quot;900&quot; alt=&quot;\u30da\u30fc\u30b8\u306e\u30ad\u30fc\u30d3\u30b8\u30e5\u30a2\u30eb&quot;&gt;\n&lt;\/picture&gt;\n<\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2) \u9045\u5ef6\u8aad\u307f\u8fbc\u307f\uff08\u753b\u50cf\u30fbiframe\u30fb\u4e0b\u90e8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09<\/h3>\n\n\n\n<p><strong>\u8aac\u660e<\/strong><br>\u30d5\u30a1\u30fc\u30b9\u30c8\u30d3\u30e5\u30fc\u306b\u4e0d\u8981\u306a\u30ea\u30bd\u30fc\u30b9\u306f\u3001\u898b\u3048\u308b\u77ac\u9593\u307e\u3067\u8aad\u307e\u306a\u3044\u306e\u304c\u9244\u5247\u3002\u521d\u671f\u30ed\u30fc\u30c9\u3092\u6700\u5c0f\u5316\u3057\u3066\u4f53\u611f\u901f\u5ea6\u3092\u4e0a\u3052\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u30dd\u30a4\u30f3\u30c8<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u753b\u50cf\u306b <code>loading=\"lazy\"<\/code> \/ <code>decoding=\"async\"<\/code>\u5c5e\u6027\u3092\u8ffd\u52a0\u3059\u308b<\/li>\n\n\n\n<li>iframe\u306b\u3082 <code>loading=\"lazy\"<\/code>\u3092\u8ffd\u52a0\u3001\u53ef\u80fd\u306a\u3089<strong>\u30b5\u30e0\u30cd\uff0b\u30af\u30ea\u30c3\u30af\u518d\u751f\u3067\u8868\u793a\u3059\u308b\u3088\u3046\u306b\u3059\u308b<\/strong><\/li>\n\n\n\n<li>\u4e0b\u90e8\u30a6\u30a3\u30b8\u30a7\u30c3\u30c8\u306f <code>IntersectionObserver<\/code> \u3067\u52d5\u7684\u306b\u751f\u6210\u3059\u308b<\/li>\n<\/ul>\n\n\n\n<p><strong>\u5b9f\u88c5\u4f8b<\/strong><\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: xml; title: ; notranslate\" title=\"\">\n&lt;img src=&quot;\/img\/gallery-01.webp&quot;\n     alt=&quot;\u30ae\u30e3\u30e9\u30ea\u30fc&quot;\n     width=&quot;1200&quot; height=&quot;800&quot;\n     loading=&quot;lazy&quot; decoding=&quot;async&quot;&gt;\n\n&lt;!-- iframe\u3082lazy --&gt;\n&lt;iframe src=&quot;https:\/\/www.youtube.com\/embed\/xxxx&quot;\n        title=&quot;\u52d5\u753b&quot;\n        loading=&quot;lazy&quot;\n        referrerpolicy=&quot;strict-origin-when-cross-origin&quot;\n        allowfullscreen&gt;&lt;\/iframe&gt;\n\n&lt;!-- IntersectionObserver\u3067\u9045\u5ef6\u5bfe\u8c61\uff1a\u753b\u50cf\uff08\u5e45\u30fb\u9ad8\u3055\u306fCLS\u5bfe\u7b56\u3067\u6307\u5b9a\uff09 --&gt;\n&lt;img class=&quot;js-lazy&quot; data-src=&quot;\/img\/gallery-01.webp&quot; alt=&quot;\u30ae\u30e3\u30e9\u30ea\u30fc&quot; width=&quot;1200&quot; height=&quot;800&quot; \/&gt;\n<\/pre><\/div>\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: css; title: ; notranslate\" title=\"\">\n\/* \u9045\u5ef6\u5bfe\u8c61\u306b\u308f\u304b\u308a\u3084\u3059\u3044\u521d\u671f\u30b9\u30bf\u30a4\u30eb\uff08\u4efb\u610f\uff09 *\/\n.js-lazy, .js-widget { opacity: 0; transition: opacity .25s ease; }\n.is-loaded { opacity: 1; }\n\n<\/pre><\/div>\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\n\/\/ IntersectionObserver \u3067\u201c\u898b\u3048\u305f\u3089\u201d\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\n(function () {\n  if (!(&#039;IntersectionObserver&#039; in window)) {\n    \/\/ \u53e4\u3044\u30d6\u30e9\u30a6\u30b6\u5411\u3051\uff08\u5fc5\u8981\u306a\u3089Polyfill\u3092\u8aad\u307f\u8fbc\u3080\uff09\n    \/\/ https:\/\/github.com\/w3c\/IntersectionObserver\/tree\/main\/polyfill\n    return;\n  }\n\n  const lazyTargets = document.querySelectorAll(&#039;.js-lazy, .js-widget&#039;);\n\n  const onIntersect = (entries, observer) =&gt; {\n    entries.forEach(entry =&gt; {\n      if (!entry.isIntersecting) return;\n\n      const el = entry.target;\n\n      \/\/ \u753b\u50cf or iframe\uff08data-src \u3092\u672c\u6765\u306e src \u306b\u5dee\u3057\u66ff\u3048\uff09\n      if (el.matches(&#039;.js-lazy&#039;)) {\n        const src = el.getAttribute(&#039;data-src&#039;);\n        if (src) el.setAttribute(&#039;src&#039;, src);\n        el.addEventListener(&#039;load&#039;, () =&gt; el.classList.add(&#039;is-loaded&#039;), { once: true });\n      }\n\n      \/\/ \u4efb\u610f\u30a6\u30a3\u30b8\u30a7\u30c3\u30c8\uff08\u898b\u3048\u305f\u3089\u521d\u671f\u5316\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u8aad\u307f\u8fbc\u3080\uff09\n      if (el.matches(&#039;.js-widget&#039;)) {\n        const scriptUrl = el.getAttribute(&#039;data-script&#039;);\n        const cfgText   = el.getAttribute(&#039;data-config&#039;) || &#039;{}&#039;;\n\n        if (scriptUrl) {\n          const s = document.createElement(&#039;script&#039;);\n          s.src = scriptUrl;\n          s.async = true;\n          s.onload = () =&gt; {\n            try {\n              const cfg = JSON.parse(cfgText);\n              \/\/ \u30b0\u30ed\u30fc\u30d0\u30eb\u521d\u671f\u5316\u95a2\u6570\u3092\u60f3\u5b9a\uff08\u5b9f\u88c5\u306b\u5408\u308f\u305b\u3066\u5909\u66f4\uff09\n              if (window.initReviewWidget) {\n                window.initReviewWidget(el, cfg);\n              }\n              el.classList.add(&#039;is-loaded&#039;);\n            } catch (e) { \/* no-op *\/ }\n          };\n          document.head.appendChild(s);\n        }\n      }\n\n      \/\/ 1\u5ea6\u8aad\u307f\u8fbc\u3093\u3060\u3089\u76e3\u8996\u89e3\u9664\n      observer.unobserve(el);\n    });\n  };\n\n  const io = new IntersectionObserver(onIntersect, {\n    root: null,           \/\/ \u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\n    rootMargin: &#039;200px&#039;,  \/\/ 200px \u624b\u524d\u3067\u201c\u5148\u8aad\u307f\u201d\u958b\u59cb\n    threshold: 0          \/\/ \u4ea4\u5dee\u3092\u691c\u77e5\u3057\u305f\u3089\u5b9f\u884c\n  });\n\n  lazyTargets.forEach(t =&gt; io.observe(t));\n})();\n\n<\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3) \u30d5\u30a9\u30f3\u30c8\u6700\u9069\u5316\uff08\u30b5\u30d6\u30bb\u30c3\u30c8\u5316\uff0fpreload\uff0fdisplay\uff09<\/h3>\n\n\n\n<p><strong>\u8aac\u660e<\/strong><br>Web\u30d5\u30a9\u30f3\u30c8\u306f\u610f\u5916\u3068\u91cd\u3044\u4e0a\u306b\u3001\u30d6\u30e9\u30a6\u30b6\u304c\u8868\u793a\u3059\u308b\u3068\u304d\u306b\u300c\u5f85\u305f\u305b\u308b\u300d\u539f\u56e0\u306b\u3082\u306a\u308a\u307e\u3059\u3002\u4f7f\u3046\u30d5\u30a9\u30f3\u30c8\u3092\u7d5e\u308a\u3053\u307f\u3001\u5148\u8aad\u307f\u3084\u8868\u793a\u8a2d\u5b9a\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u201c\u5f85\u305f\u305b\u306a\u3044\u201d\u8a2d\u5b9a\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u30dd\u30a4\u30f3\u30c8<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528\u6587\u5b57\u3060\u3051\u306e<strong>\u30b5\u30d6\u30bb\u30c3\u30c8<\/strong>\u5316\u30d5\u30a9\u30f3\u30c8\u3092\u4f7f\u3046\uff08\u65e5\u672c\u8a9e\u30d5\u30a9\u30f3\u30c8\u306f\u4f7f\u7528\u30a6\u30a7\u30a4\u30c8\u3082\u6700\u5c0f\u9650\u306b\uff09<\/li>\n\n\n\n<li>\u521d\u56de\u306b\u5fc5\u8981\u306a\u30d5\u30a1\u30a4\u30eb\u3060\u3051<code>&lt;link rel=\"preload\"&gt;<\/code>\u3067\u5148\u8aad\u307f<\/li>\n\n\n\n<li><code>font-display: swap<\/code> \u3067\u4f55\u3082\u898b\u3048\u306a\u3044<strong>\u7a7a\u767d\u6642\u9593\u3092\u56de\u907f<\/strong><\/li>\n<\/ul>\n\n\n\n<p><strong>\u5b9f\u88c5\u4f8b<\/strong><\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: xml; title: ; notranslate\" title=\"\">\n&lt;link rel=&quot;preload&quot; as=&quot;font&quot; href=&quot;\/fonts\/NotoSansJP-subset.woff2&quot; type=&quot;font\/woff2&quot; crossorigin&gt;\n\n&lt;style&gt;\n@font-face {\n  font-family: &#039;NotoSansJP&#039;;\n  src: url(&#039;\/fonts\/NotoSansJP-subset.woff2&#039;) format(&#039;woff2&#039;);\n  font-weight: 400; font-style: normal;\n  font-display: swap; \/* FOIT\u56de\u907f *\/\n}\nbody { font-family: system-ui, &quot;NotoSansJP&quot;, sans-serif; }\n&lt;\/style&gt;\n<\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4) JavaScript\u306e\u8efd\u91cf\u5316\uff08defer\/async\u30fb\u5206\u5272\u30fb\u672a\u4f7f\u7528\u524a\u9664\uff09<\/h3>\n\n\n\n<p><strong>\u8aac\u660e<\/strong><br>JavaScript\u306e\u5b9f\u884c\u306fHTML\u3084CSS\u306e\u8868\u793a\u306b\u52a0\u3048\u3066\u30d1\u30bd\u30b3\u30f3\u306e\u30d1\u30ef\u30fc\u3092\u4f7f\u3044\u307e\u3059\u3002\u30d5\u30a1\u30fc\u30b9\u30c8\u30d3\u30e5\u30fc\u306e\u8868\u793a\u306b\u4e0d\u8981\u306aJavaScript\u3092\u5f8c\u56de\u3057\u306b\u3057\u3001<strong>\u5b9f\u884c\u91cf<\/strong>\u3092\u6e1b\u3089\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u30dd\u30a4\u30f3\u30c8<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u521d\u671f\u63cf\u753b\u306b\u95a2\u4fc2\u306a\u3044\u30b9\u30af\u30ea\u30d7\u30c8\u306f <code>defer<\/code> \/ <code>async<\/code>\u5c5e\u6027\u3092\u8ffd\u52a0<\/li>\n\n\n\n<li>\u30da\u30fc\u30b8\u5225\u306b\u30d5\u30a1\u30a4\u30eb\u3092\u5206\u3051\u3066\u9045\u5ef6\u3088\u307f\u3053\u307f<\/li>\n\n\n\n<li>\u30b5\u30a4\u30c8\u516c\u958b\u524d\u306b\u306f\u30d3\u30eb\u30c9\u30c4\u30fc\u30eb\uff08Webpack\u306a\u3069\uff09\u3067\u30c4\u30ea\u30fc\u30b7\u30a7\u30a4\u30ad\u30f3\u30b0\u3067<strong>\u672a\u4f7f\u7528\u30b3\u30fc\u30c9\u9664\u53bb<\/strong><\/li>\n\n\n\n<li>\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30bf\u30b0\u306f<strong>\u68da\u5378\u3057<\/strong>\u3057\u3066\u6700\u5c0f\u9650\u306b\uff08\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u30bf\u30b0\u306f\u5b9f\u306f\u3068\u3066\u3082\u91cd\u3044\u3067\u3059\uff09<\/li>\n<\/ul>\n\n\n\n<p><strong>\u5b9f\u88c5\u4f8b<\/strong><\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: xml; title: ; notranslate\" title=\"\">\n&lt;script src=&quot;\/assets\/app.js&quot; defer&gt;&lt;\/script&gt; &lt;!-- HTML\u89e3\u6790\u5f8c\u306b\u5b9f\u884c --&gt;\n&lt;script src=&quot;\/assets\/analytics.js&quot; async&gt;&lt;\/script&gt; &lt;!-- \u4f9d\u5b58\u306a\u3057\u306f\u4e26\u884c\u8aad\u307f\u8fbc\u307f --&gt;\n\n&lt;!--\u30da\u30fc\u30b8\u5225\u306b\u9045\u5ef6import\uff08\u4f8b\uff1aES Modules\uff09 --&gt;\n&lt;script type=&quot;module&quot;&gt;\n  if (location.pathname.startsWith(&#039;\/dashboard&#039;)) {\n    import(&#039;\/assets\/dashboard.js&#039;);\n  }\n&lt;\/script&gt;\n<\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">5) CSS\u306e\u8efd\u91cf\u5316\uff08\u30af\u30ea\u30c6\u30a3\u30ab\u30ebCSS\uff0f\u672a\u4f7f\u7528\u524a\u9664\uff0f\u8a2d\u8a08\u306e\u898b\u76f4\u3057\uff09<\/h3>\n\n\n\n<p><strong>\u8aac\u660e<\/strong><br>CSS\u306f\u30da\u30fc\u30b8\u3092\u8868\u793a\u3059\u308b\u305f\u3081\u306e\u201c\u57fa\u790e\u201d\u3068\u3082\u3044\u3048\u307e\u3059\u3002\u30d5\u30a1\u30fc\u30b9\u30c8\u30d3\u30e5\u30fc\u306b\u5fc5\u8981\u306a\u6700\u5c0f\u9650\u3060\u3051\u5148\u306b\u9069\u7528\u3057\u3001\u6b8b\u308a\u306f\u5f8c\u304b\u3089\u8aad\u307f\u8fbc\u307f\u307e\u3059\u3002\u4f7f\u3063\u3066\u3044\u306a\u3044\u5ba3\u8a00\u3082\u6574\u7406\u3057\u3066\u30b5\u30a4\u30ba\u3092\u524a\u6e1b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><strong>\u30dd\u30a4\u30f3\u30c8<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30af\u30ea\u30c6\u30a3\u30ab\u30ebCSS\u3092<strong>\u30a4\u30f3\u30e9\u30a4\u30f3<\/strong>\u3001\u6b8b\u308a\u306f\u9045\u5ef6\u30ed\u30fc\u30c9\u3067\u8aad\u307f\u8fbc\u3080<\/li>\n\n\n\n<li>Purge\/Content-aware\u30c4\u30fc\u30eb\uff08\u30d3\u30eb\u30c9\u30c4\u30fc\u30eb\u306e\u30d7\u30e9\u30b0\u30a4\u30f3\uff09\u3067<strong>\u672a\u4f7f\u7528\u30af\u30e9\u30b9\u524a\u9664<\/strong><\/li>\n\n\n\n<li>BEM\/Utility\u306a\u3069<strong>\u4e00\u8cab\u3057\u305f\u8a2d\u8a08<\/strong>\u3067\u3001\u305d\u3082\u305d\u3082\u91cd\u8907\u3057\u305f\u308a\u3001\u5197\u9577\u306b\u306a\u3089\u306a\u3044\u3088\u3046\u306b\u5236\u4f5c\u3092\u3059\u308b<\/li>\n<\/ul>\n\n\n\n<p><strong>\u5b9f\u88c5\u4f8b<\/strong><\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: xml; title: ; notranslate\" title=\"\">\n&lt;!-- 1. \u30af\u30ea\u30c6\u30a3\u30ab\u30ebCSS\u306e\u307f\u30a4\u30f3\u30e9\u30a4\u30f3 --&gt;\n&lt;style&gt;\n\/* above-the-fold \u306e\u6700\u5c0f\u9650 *\/\n.header{display:flex;align-items:center;min-height:56px}\n.hero{padding:8vw 0 4vw}\n&lt;\/style&gt;\n\n&lt;!-- 2. \u6b8b\u308a\u306f\u9045\u5ef6\u8aad\u307f\u8fbc\u307f --&gt;\n&lt;link rel=&quot;preload&quot; as=&quot;style&quot; href=&quot;\/assets\/app.css&quot;&gt;\n&lt;link rel=&quot;stylesheet&quot; href=&quot;\/assets\/app.css&quot; media=&quot;print&quot; onload=&quot;this.media=&#039;all&#039;&quot;&gt;\n&lt;noscript&gt;&lt;link rel=&quot;stylesheet&quot; href=&quot;\/assets\/app.css&quot;&gt;&lt;\/noscript&gt;\n<\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">6) \u914d\u4fe1\u6700\u9069\u5316\uff08\u5727\u7e2e\u30fbHTTP\/2\/3\u30fbCDN\u30fb\u30ad\u30e3\u30c3\u30b7\u30e5\uff09<\/h3>\n\n\n\n<p><strong>\u8aac\u660e<\/strong><br>\u540c\u3058\u30d5\u30a1\u30a4\u30eb\u3067\u3082\u3001\u3069\u3046\u3084\u3063\u3066\u300c\u914d\u308b\u304b\u300d\u3067\u901f\u5ea6\u306f\u5927\u304d\u304f\u5909\u308f\u308a\u307e\u3059\u3002\u30b5\u30fc\u30d0\u5074\u306e\u5727\u7e2e\u3068\u591a\u91cd\u5316\u3001CDN\u30ad\u30e3\u30c3\u30b7\u30e5\u3067<strong>\u5f80\u5fa9\u56de\u6570\u3068\u30b5\u30a4\u30ba<\/strong>\u3092\u6e1b\u3089\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u30dd\u30a4\u30f3\u30c8<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30c6\u30ad\u30b9\u30c8\u7cfb\u306b <strong>Brotli<\/strong>\uff08fallback\u3067Gzip\uff09\u5727\u7e2e\u3092\u5229\u7528\uff08\u203b\u30b5\u30fc\u30d0\u304c\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u5834\u5408\uff09<\/li>\n\n\n\n<li><strong>HTTP\/2\/HTTP\/3<\/strong>\u3067\u591a\u91cd\u5316\uff08\u540c\u6642\u30ea\u30af\u30a8\u30b9\u30c8\u306b\u5f37\u3044\u3067\u3059\uff09<\/li>\n\n\n\n<li><strong>CDN<\/strong>\u30b5\u30fc\u30d3\u30b9\u306e\u6d3b\u7528\u3067\u5730\u57df\u6700\u5bc4\u308a\u304b\u3089\u914d\u4fe1\u3001<strong>\u9577\u671f\u30ad\u30e3\u30c3\u30b7\u30e5\uff0b\u30cf\u30c3\u30b7\u30e5\u540d<\/strong><\/li>\n\n\n\n<li>\u91cd\u8981\u30c9\u30e1\u30a4\u30f3\u3078\u306e<code>preconnect<\/code>\u3067\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u77ed\u7e2e<\/li>\n<\/ul>\n\n\n\n<p><strong>\u5b9f\u88c5\u4f8b<\/strong>\uff08.htaccess\uff09<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n# Cache-Control\uff08\u9759\u7684\u30a2\u30bb\u30c3\u30c8\uff09\nCache-Control: public, max-age=31536000, immutable\n\n# HTML\u306f\u77ed\u3081\nCache-Control: no-cache\n\n# Nginx\u4f8b\uff1aBrotli\uff08\u30b5\u30fc\u30d0\u8a2d\u5b9a\uff09\nbrotli on;\nbrotli_comp_level 6;\nbrotli_types text\/plain text\/css application\/javascript application\/json image\/svg+xml;\n\n# HTTP\u30d8\u30c3\u30c0\u3067\u306e\u30d2\u30f3\u30c8\nLink: &amp;lt;https:\/\/cdn.example.com&gt;; rel=preconnect; crossorigin\n<\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow 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