{"id":9189,"date":"2025-09-29T16:01:39","date_gmt":"2025-09-29T07:01:39","guid":{"rendered":"https:\/\/fastcoding.jp\/blog\/?p=9189"},"modified":"2025-09-29T16:01:51","modified_gmt":"2025-09-29T07:01:51","slug":"60fps%e3%81%a7%e5%bf%ab%e9%81%a9%e8%a1%a8%e7%a4%ba%ef%bc%81%e3%80%8c%e4%bb%ae%e6%83%b3%e3%82%b9%e3%82%af%e3%83%ad%e3%83%bc%e3%83%ab%e3%80%8d%e3%82%92%e4%bd%bf%e3%81%a3%e3%81%9f%e5%ae%9f%e8%a3%85","status":"publish","type":"post","link":"https:\/\/fastcoding.jp\/blog\/all\/frontend\/60fps%e3%81%a7%e5%bf%ab%e9%81%a9%e8%a1%a8%e7%a4%ba%ef%bc%81%e3%80%8c%e4%bb%ae%e6%83%b3%e3%82%b9%e3%82%af%e3%83%ad%e3%83%bc%e3%83%ab%e3%80%8d%e3%82%92%e4%bd%bf%e3%81%a3%e3%81%9f%e5%ae%9f%e8%a3%85\/","title":{"rendered":"60fps\u3067\u5feb\u9069\u8868\u793a\uff01\u300c\u4eee\u60f3\u30b9\u30af\u30ed\u30fc\u30eb\u300d\u3092\u4f7f\u3063\u305f\u5b9f\u88c5\u6cd5\uff08React\u3068Vue\u5171\u901a\u7de8\uff09"},"content":{"rendered":"<div class=\"the_content\">\n<p>\u3053\u3093\u306b\u3061\u306f\u3001\u682a\u5f0f\u4f1a\u793e\u30d5\u30a1\u30b9\u30c8\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u306e\u30d5\u30eb\u30b9\u30bf\u30c3\u30af\u30a8\u30f3\u30b8\u30cb\u30a2\u3001\u72ec\u8eab\u8cb4\u65cfFire\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u30d5\u30ed\u30f3\u30c8\u30a8\u30f3\u30c9\u306e\u958b\u767a\u3067\u91cd\u8981\u306a\u306e\u306f\u300c\u4f7f\u3044\u3084\u3059\u3055\u300d\u3068\u300c\u8868\u793a\u30b9\u30d4\u30fc\u30c9\u300d\u3001\u3053\u306e\uff12\u3064\u306b\u5c3d\u304d\u307e\u3059\u3002\u300c\u4f7f\u3044\u3084\u3059\u3055\u300d\u306f\u30c7\u30b6\u30a4\u30f3\u3084\u5229\u7528\u8005\u306e\u5229\u7528\u30b7\u30fc\u30f3\u3082\u8003\u616e\u3055\u308c\u307e\u3059\u304c\u3001\u30b9\u30d4\u30fc\u30c9\u306b\u3064\u3044\u3066\u306f\u3069\u3093\u306a\u6642\u3067\u3082\u65e9\u3044\u3053\u3068\u306b\u8d8a\u3057\u305f\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u7279\u306b\u5927\u91cf\u306e\u30c7\u30fc\u30bf\u3092\u7d20\u65e9\u304f\u8868\u793a\u3059\u308b\u3053\u3068\u306f\u3001UIUX\u3084\u30c7\u30b6\u30a4\u30f3\u4ee5\u524d\u306b\u91cd\u8996\u3055\u308c\u308b\u30dd\u30a4\u30f3\u30c8\u3067\u3059\u3002\u79c1\u305f\u3061\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u3082\u3001\u6570\u5343\u4ef6\u306e\u30c7\u30fc\u30bf\u3092\u30b9\u30e0\u30fc\u30ba\u306b\u8868\u793a\u3059\u308b\u5fc5\u8981\u304c\u3042\u3063\u305f\u306e\u3067\u3001\u3053\u306e\u8a18\u4e8b\u3067\u306f\u305d\u306e\u89e3\u6c7a\u7b56&#8221;\u4eee\u60f3\u30b9\u30af\u30ed\u30fc\u30eb&#8221;\u306e\u5177\u4f53\u7684\u306a\u5b9f\u88c5\u6cd5\u3092React\u3084Vue\u3092\u7528\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u901a\u5e38\u306e\u65b9\u6cd5\u3067\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u4f4e\u4e0b\u3059\u308b\u7406\u7531<\/h2>\n\n\n\n<p>\u4ee5\u524d\u306f\u3001\u9577\u3044\u30ea\u30b9\u30c8\u3092\u8868\u793a\u3059\u308b\u3068\u304d\u306b\u5e7e\u5ea6\u3082\u30b9\u30af\u30ed\u30fc\u30eb\u3057\u3064\u3064Ajax\u8aad\u307f\u8fbc\u307f\u3059\u308b\u65b9\u6cd5\u304c\u63a1\u3089\u308c\u3066\u3044\u307e\u3057\u305f\u304c\u3001\u3053\u308c\u306f\u30d6\u30e9\u30a6\u30b6\u306e\u30e1\u30e2\u30ea\u3092\u904e\u5270\u306b\u6d88\u8cbb\u3059\u308b\u3053\u3068\u304c\u554f\u984c\u3067\u3057\u305f\u3002\u7279\u306b1,000\u4ef6\u4ee5\u4e0a\u306e\u30c7\u30fc\u30bf\u306b\u306a\u308b\u3068\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u60aa\u5316\u3059\u308b\u306e\u306f\u907f\u3051\u3089\u308c\u307e\u305b\u3093\u3002\u305d\u308c\u306b\u3001\u30e2\u30d0\u30a4\u30eb\u74b0\u5883\u3067\u306f\u30ab\u30af\u3064\u304f\u3053\u3068\u3055\u3048\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4eee\u60f3\u30b9\u30af\u30ed\u30fc\u30eb\u306e\u30dd\u30a4\u30f3\u30c8<\/h2>\n\n\n\n<p>\u4eca\u56de\u306f\u300c\u4eee\u60f3\u30b9\u30af\u30ed\u30fc\u30eb\u300d\u3068\u547c\u3070\u308c\u308b\u624b\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002\u8868\u793a\u3055\u308c\u308b\u7bc4\u56f2\u5185\u3060\u3051DOM\u3092\u751f\u6210\u3057\u3001\u898b\u3048\u306a\u3044\u90e8\u5206\u306f\u751f\u6210\u3057\u306a\u3044\u3053\u3068\u3067\u30b7\u30b9\u30c6\u30e0\u3078\u306e\u8ca0\u62c5\u3092\u8efd\u304f\u3057\u307e\u3059\u3002\u3053\u308c\u306e\u304a\u304b\u3052\u3067\u3001\u30b9\u30af\u30ed\u30fc\u30eb\u304c\u30b9\u30e0\u30fc\u30ba\u3067\u304a\u3088\u305d60fps\u7a0b\u5ea6\u306e\u3075\u3064\u3046\u306e\u8868\u793a\u304c\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u898b\u3048\u308b\u90e8\u5206\u3060\u3051\u3092\u8a08\u7b97<\/h3>\n\n\n\n<p>\u307e\u305a\u91cd\u8981\u306b\u306a\u308b\u306e\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u3069\u306e\u4f4d\u7f6e\u307e\u3067\u30b9\u30af\u30ed\u30fc\u30eb\u3057\u3066\u3044\u308b\u304b\u3092\u8a08\u7b97\u3059\u308b\u90e8\u5206\u3067\u3059\u3002\u3053\u308c\u304c\u57fa\u6e96\u306b\u306a\u308a\u3001\u3069\u306e\u30a2\u30a4\u30c6\u30e0\u3092\u8868\u793a\u3059\u308b\u304b\u304c\u6c7a\u307e\u308a\u307e\u3059\u3002React\u306e\u5834\u5408\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a08\u7b97\u3057\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\nconst { start, end, offsetY } = useMemo(() =&gt; {\n  const startIdx = Math.floor(scrollTop \/ rowHeight);\n  const visibleCount = Math.ceil(height \/ rowHeight);\n  const from = Math.max(0, startIdx - overscan);\n  const to = Math.min(items.length, startIdx + visibleCount + overscan);\n  const y = from * rowHeight;\n  return { start: from, end: to, offsetY: y };\n}, &#x5B;scrollTop, height, rowHeight, overscan, items.length]);\n<\/pre><\/div>\n\n\n<p>\u3053\u3053\u3067\u6c42\u3081\u305f\u958b\u59cb\u3068\u7d42\u4e86\u306f\u3001\u914d\u5217\u304b\u3089\u5207\u308a\u51fa\u3059\u898b\u304b\u3051\u4e0a\u306e\u30a2\u30a4\u30c6\u30e0\u7bc4\u56f2\u3092\u610f\u5473\u3057\u307e\u3059\u3002<code>offsetY<\/code> \u306f\u3001\u5207\u308a\u51fa\u3057\u305f\u5c0f\u3055\u306a\u65ad\u7247\u3092\u672c\u6765\u306e\u4f4d\u7f6e\u306b\u898b\u305b\u308b\u305f\u3081\u306e\u57fa\u6e96\u3067\u3001\u89aa\u30e9\u30c3\u30d1\u30fc\u3092 <code>transform: translateY(...)<\/code> \u3067\u7e26\u306b\u79fb\u52d5\u3055\u305b\u308b\u3068\u30ec\u30a4\u30a2\u30a6\u30c8\u8ca0\u8377\u3092\u6291\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u30b9\u30af\u30ed\u30fc\u30eb\u306e\u53d6\u308a\u8fbc\u307f\u306f\u4e00\u30d5\u30ec\u30fc\u30e0\u4e00\u56de\u306b\u6291\u3048\u308b<\/h3>\n\n\n\n<p>\u30a4\u30d9\u30f3\u30c8\u306f\u9ad8\u983b\u5ea6\u3067\u767a\u706b\u3057\u307e\u3059\u304c\u3001\u72b6\u614b\u66f4\u65b0\u3092\u4e71\u767a\u3059\u308b\u3068\u4f53\u611f\u304c\u8352\u308c\u307e\u3059\u3002\u30d6\u30e9\u30a6\u30b6\u306e\u63cf\u753b\u30b5\u30a4\u30af\u30eb\u306b\u5408\u308f\u305b\u3066\u30011\u30d5\u30ec\u30fc\u30e0\u3042\u305f\u308a\u4e00\u5ea6\u3060\u3051\u53d6\u308a\u8fbc\u3080\u306e\u304c\u5b89\u5168\u3067\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\nuseEffect(() =&gt; {\n  const el = viewportRef.current!;\n  let rafId = 0;\n  const onScroll = () =&gt; {\n    if (rafId) return;\n    rafId = requestAnimationFrame(() =&gt; {\n      setScrollTop(el.scrollTop);\n      rafId = 0;\n    });\n  };\n  el.addEventListener(&quot;scroll&quot;, onScroll, { passive: true });\n  return () =&gt; {\n    el.removeEventListener(&quot;scroll&quot;, onScroll);\n    if (rafId) cancelAnimationFrame(rafId);\n  };\n}, &#x5B;]);\n<\/pre><\/div>\n\n\n<p>\u3053\u306e\u5f62\u306a\u3089\u3001\u30b9\u30af\u30ed\u30fc\u30eb\u4e2d\u3067\u3082\u4f59\u8a08\u306a\u518d\u8a08\u7b97\u304c\u7a4d\u307f\u4e0a\u304c\u3089\u305a\u3001\u4f53\u611f\u7684\u306b\u306f\u8efd\u3081\u306e\u307e\u307e\u3067DOM\u306e\u66f4\u65b0\u304c\u3067\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">DOM\u3092\u4f5c\u308a\u76f4\u3055\u305a\u4e2d\u8eab\u3060\u3051\u5dee\u3057\u66ff\u3048\u308b\u305f\u3081\u306e\u30d7\u30fc\u30eb\u8a2d\u8a08<\/h3>\n\n\n\n<p>\u53ef\u8996\u884c\uff1d\u6570\u5341\u4ef6\u7a0b\u5ea6\u3068\u3044\u3046\u524d\u63d0\u3067\u3082\u3001\u6bce\u56de\u306e\u5dee\u3057\u66ff\u3048\u3067\u518d\u30de\u30a6\u30f3\u30c8\u304c\u8d77\u304d\u308b\u3084\u3063\u3071\u308a\u753b\u9762\u304c\u30c1\u30e9\u30c1\u30e9\u3057\u307e\u3059\u3002\u305d\u3053\u3067\u3001\u753b\u9762\u306b\u5165\u308b\u884c\u6570\u3068\u305d\u306e\u4e0a\u4e0b\u3092\u5c11\u3057\u30d0\u30c3\u30d5\u30a1\u3068\u3057\u3066\u6301\u305f\u305b\u305f\u3001\u5408\u8a08\u3057\u305f\u56fa\u5b9a\u30b5\u30a4\u30ba\u306e\u30b9\u30ed\u30c3\u30c8\u3092\u7528\u610f\u3057\u3001<code>key<\/code> \u3092\u30b9\u30ed\u30c3\u30c8\u756a\u53f7\u3067\u56fa\u5b9a\u3057\u307e\u3059\u3002\u5404\u30b9\u30ed\u30c3\u30c8\u306f <code>transform<\/code> \u3067\u7e26\u65b9\u5411\u306b\u914d\u7f6e\u3057\u3001\u4e2d\u8eab\u3060\u3051\u3092\u5dee\u3057\u66ff\u3048\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\n{Array.from({ length: poolSize }, (_, slot) =&gt; {\n  const item = slice&#x5B;slot];\n  const top = slot * rowHeight;\n  return (\n    &lt;RowSlot\n      key={slot}      \/\/ \u30b9\u30ed\u30c3\u30c8\u756a\u53f7\u3092\u56fa\u5b9a\n      item={item}\n      top={top}\n      height={rowHeight}\n    \/&gt;\n  );\n})}\n<\/pre><\/div>\n\n\n<p>\u3053\u306e\u65b9\u5f0f\u306a\u3089\u3001\u30b9\u30af\u30ed\u30fc\u30eb\u3057\u3066\u3082DOM\u30ce\u30fc\u30c9\u81ea\u4f53\u306f\u5909\u308f\u3089\u305a\u3001\u30c6\u30ad\u30b9\u30c8\u306a\u3069\u306e\u5185\u5bb9\u3060\u3051\u304c\u5165\u308c\u66ff\u308f\u308a\u307e\u3059\u3002\u30d5\u30a9\u30fc\u30ab\u30b9\u3084\u884c\u9078\u629e\u306e\u72b6\u614b\u3092\u30b9\u30ed\u30c3\u30c8\u5074\u3067\u6301\u3066\u308b\u305f\u3081\u3001\u30a4\u30f3\u30bf\u30e9\u30af\u30b7\u30e7\u30f3\u306e\u7834\u7dbb\u3082\u6291\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">IntersectionObserver\u3067\u672b\u5c3e\u3092\u76e3\u8996\u3057\u3066\u5148\u8aad\u307f\u3059\u308b<\/h3>\n\n\n\n<p>\u8868\u793a\u304c\u672b\u5c3e\u306b\u8fd1\u3065\u3044\u305f\u3068\u304d\u306b\u3001\u5341\u5206\u306a\u4f59\u88d5\u3092\u3082\u3063\u3066\u6b21\u306e\u30da\u30fc\u30b8\u3092\u53d6\u308a\u306b\u884c\u304f\u3068\u3001\u9023\u7d9a\u3057\u3066\u30da\u30fc\u30b8\u304c\u3042\u308b\u3088\u3046\u306b\u898b\u3048\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u30b9\u30af\u30ed\u30fc\u30eb\u30b3\u30f3\u30c6\u30ca\u3092 <code>root<\/code> \u306b\u6307\u5b9a\u3057\u3001\u672b\u5c3e\u306e\u30b9\u30ed\u30c3\u30c8\u304c\u53ef\u8996\u306b\u306a\u3063\u305f\u3089\u30d5\u30a7\u30c3\u30c1\u3092\u547c\u3073\u307e\u3059\u3002\u91cd\u8907\u30ea\u30af\u30a8\u30b9\u30c8\u306f <code>AbortController<\/code> \u3067\u6291\u5236\u3057\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\nuseEffect(() =&gt; {\n  if (!rootEl || !sentinelEl) return;\n  const io = new IntersectionObserver((entries) =&gt; {\n    if (entries&#x5B;0].isIntersecting) onReach();\n  }, { root: rootEl, rootMargin: &quot;600px 0px&quot; });\n  io.observe(sentinelEl);\n  return () =&gt; io.disconnect();\n}, &#x5B;rootEl, sentinelEl, onReach]);\n<\/pre><\/div>\n\n\n<p><code>rootMargin<\/code> \u3092\u3084\u3084\u5927\u304d\u3081\u306b\u53d6\u308c\u3070\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u672b\u5c3e\u306b\u7740\u304f\u3088\u308a\u524d\u306b\u901a\u4fe1\u3092\u8d70\u3089\u305b\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\uff08React\uff09<\/h3>\n\n\n\n<div class=\"wp-block-cp-codepen-gutenberg-embed-block cp_embed_wrapper\"><iframe id=\"cp_embed_NPxNgMm\" src=\"\/\/codepen.io\/anon\/embed\/NPxNgMm?height=450&amp;theme-id=1&amp;slug-hash=NPxNgMm&amp;default-tab=result\" height=\"450\" scrolling=\"no\" frameborder=\"0\" allowfullscreen allowpaymentrequest name=\"CodePen Embed NPxNgMm\" title=\"CodePen Embed NPxNgMm\" class=\"cp_embed_iframe\" style=\"width:100%;overflow:hidden\">CodePen Embed Fallback<\/iframe><\/div>\n\n\n\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\uff08Vue.js\uff09<\/p>\n\n\n\n<div class=\"wp-block-cp-codepen-gutenberg-embed-block cp_embed_wrapper\"><iframe id=\"cp_embed_NPxNgOV\" src=\"\/\/codepen.io\/anon\/embed\/NPxNgOV?height=450&amp;theme-id=1&amp;slug-hash=NPxNgOV&amp;default-tab=result\" height=\"450\" scrolling=\"no\" frameborder=\"0\" allowfullscreen allowpaymentrequest name=\"CodePen Embed NPxNgOV\" title=\"CodePen Embed NPxNgOV\" class=\"cp_embed_iframe\" style=\"width:100%;overflow:hidden\">CodePen Embed Fallback<\/iframe><\/div>\n\n\n\n<p class=\"has-small-font-size\">\u203b\u30c0\u30df\u30fc\u30c7\u30fc\u30bf\u751f\u6210\u306e\u305f\u3081fakeapi\u3092\u57cb\u3081\u8fbc\u3093\u3067\u304a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306e\u52b9\u679c<\/h2>\n\n\n\n<p>\u3042\u308b\u901a\u8ca9\u30b5\u30a4\u30c8\u306e\u7ba1\u7406\u753b\u9762\u306b\u3053\u306e\u6280\u8853\u3092\u53d6\u308a\u5165\u308c\u305f\u3068\u3053\u308d\u30013,000\u4ef6\u3092\u8d85\u3048\u308b\u5546\u54c1\u60c5\u5831\u3092\u8868\u793a\u3057\u306a\u304c\u3089\u308260fps\u3092\u7dad\u6301\u3067\u304d\u307e\u3057\u305f\u3002\u30e6\u30fc\u30b6\u30fc\u304b\u3089\u306f\u300c\u53cd\u5fdc\u304c\u65e9\u3044\u300d\u3068\u3044\u3046\u611f\u60f3\u3092\u591a\u304f\u3044\u305f\u3060\u304d\u3001\u5b9f\u969b\u30da\u30fc\u30b8\u5185\u306e\u30af\u30ea\u30c3\u30af\u7387\u306f\u5927\u5e45\u306b\u4f38\u3073\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u304a\u308f\u308a\u306b<\/h2>\n\n\n\n<p>\u4eee\u60f3\u30b9\u30af\u30ed\u30fc\u30eb\u306f\u5927\u91cf\u30c7\u30fc\u30bf\u3092\u6271\u3046\u4e0a\u3067\u975e\u5e38\u306b\u6709\u52b9\u306a\u89e3\u6c7a\u7b56\u3067\u3059\u300260fps\u3092\u76ee\u6307\u3059\u3053\u3068\u3067\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u5168\u4f53\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u5411\u4e0a\u3057\u307e\u3059\u3002\u6b21\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u305c\u3072\u8a66\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002\u4eee\u60f3\u30b9\u30af\u30ed\u30fc\u30eb\u306e\u5b9f\u88c5\u306b\u3064\u3044\u3066\u306e\u3054\u76f8\u8ac7\u306f\u3001<a 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