{"id":39418,"date":"2026-10-09T13:15:45","date_gmt":"2026-10-09T04:15:45","guid":{"rendered":"https:\/\/uxdaystokyo.com\/articles\/?post_type=glossary&#038;p=39418"},"modified":"2026-10-09T13:15:45","modified_gmt":"2026-10-09T04:15:45","slug":"ttfb","status":"publish","type":"glossary","link":"https:\/\/uxdaystokyo.com\/articles\/glossary\/ttfb\/","title":{"rendered":"TTFB\uff08Time To First Byte\uff09"},"content":{"rendered":"<p>TTFB\u3068\u306f\u3001\u30da\u30fc\u30b8\u306e\u9045\u3055\u304c\u30b5\u30fc\u30d0\u30fc\u306e\u8fd4\u4e8b\u5f85\u3061\u306b\u3088\u308b\u3082\u306e\u304b\u3069\u3046\u304b\u3092\u5207\u308a\u5206\u3051\u308b\u305f\u3081\u306b\u3001\u30da\u30fc\u30b8\u3092\u958b\u3044\u3066\u304b\u3089\u6700\u521d\u306e\u30c7\u30fc\u30bf\u304c\u8fd4\u308a\u59cb\u3081\u308b\u307e\u3067\u3092\u6e2c\u308b\u6307\u6a19\u3067\u3042\u308b\u3002\u8868\u793a\u901f\u5ea6\u3092\u6e2c\u308b\u6307\u6a19\u306f\u3044\u304f\u3064\u3082\u3042\u308b\u304c\u3001TTFB\u306f\u305d\u306e\u3046\u3061\u6700\u3082\u624b\u524d\u3001\u307e\u3060\u753b\u9762\u306b\u4f55\u3082\u51fa\u3066\u3044\u306a\u3044\u533a\u9593\u3060\u3051\u3092\u53d7\u3051\u6301\u3064\u3002<\/p>\n<p>\u305f\u3068\u3048\u3070\u3001\u8a18\u4e8b\u30da\u30fc\u30b8\u3092\u958b\u3044\u3066\u304b\u30893\u79d2\u9593\u3001\u753b\u9762\u304c\u771f\u3063\u767d\u306a\u307e\u307e\u3060\u3063\u305f\u3068\u3059\u308b\u3002TTFB\u304c2.5\u79d2\u306a\u3089\u3001\u305d\u306e3\u79d2\u306e\u307b\u3068\u3093\u3069\u306f\u30b5\u30fc\u30d0\u30fc\u306e\u8fd4\u4e8b\u3092\u5f85\u3063\u3066\u3044\u305f\u6642\u9593\u3067\u3042\u308b\u3002\u753b\u50cf\u3092\u8efd\u304f\u3057\u3066\u3082\u3001\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u6e1b\u3089\u3057\u3066\u3082\u3001\u3053\u306e2.5\u79d2\u306f\u7e2e\u307e\u3089\u306a\u3044\u3002<\/p>\n<h2>\u767d\u3044\u753b\u9762\u306e\u3069\u3053\u307e\u3067\u304c\u5f85\u3061\u6642\u9593\u304b<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2026\/10\/ttfb00-1024x373.png\" alt=\"\" width=\"1024\" height=\"373\" class=\"alignnone size-large wp-image-39421\" srcset=\"https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2026\/10\/ttfb00-1024x373.png 1024w, https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2026\/10\/ttfb00-300x109.png 300w, https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2026\/10\/ttfb00-768x280.png 768w, https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2026\/10\/ttfb00-1536x560.png 1536w, https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2026\/10\/ttfb00.png 1772w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p>TTFB\u304c\u7b54\u3048\u308b\u306e\u306f\u3001\u305d\u306e\u9045\u3055\u304c\u8fd4\u4e8b\u3092\u5f85\u3063\u3066\u3044\u308b\u6642\u9593\u306a\u306e\u304b\u3001\u8fd4\u4e8b\u304c\u6765\u305f\u3042\u3068\u306e\u6642\u9593\u306a\u306e\u304b\u3001\u3068\u3044\u3046\u5207\u308a\u5206\u3051\u3067\u3042\u308b\u3002<\/p>\n<p>\u6700\u521d\u306e\u30c7\u30fc\u30bf\u3068\u306f\u3001\u30b5\u30fc\u30d0\u30fc\u304c\u8fd4\u3059\u5fdc\u7b54\u306e\u5148\u982d1\u30d0\u30a4\u30c8\u3001\u3064\u307e\u308a\u3044\u3061\u3070\u3093\u5c0f\u3055\u3044\u5358\u4f4d\u306e\u3072\u3068\u304b\u3051\u3089\u3092\u6307\u3059\u3002\u4e2d\u8eab\u304c\u5168\u90e8\u305d\u308d\u3046\u5fc5\u8981\u306f\u306a\u3044\u3002\u5148\u982d\u304c\u5c4a\u3044\u305f\u77ac\u9593\u306b\u8a08\u6e2c\u304c\u6b62\u307e\u308b\u306e\u3067\u3001TTFB\u306f\u300c\u30b5\u30fc\u30d0\u30fc\u304c\u53e3\u3092\u958b\u304f\u307e\u3067\u306e\u6642\u9593\u300d\u306b\u8fd1\u3044\u3002<\/p>\n<p>\u3053\u306e\u5f85\u3061\u6642\u9593\u306f\u3072\u3068\u3064\u306e\u4f5c\u696d\u3067\u306f\u306a\u304f\u3001<a href=\"https:\/\/web.dev\/articles\/ttfb\">Google\u306eweb.dev\u306b\u3088\u308b\u3068<\/a>\u3044\u304f\u3064\u304b\u306e\u533a\u9593\u306e\u5408\u8a08\u306b\u3042\u305f\u308b\u3002\u9577\u304b\u3063\u305f\u3068\u304d\u306b\u7591\u3046\u5148\u306f\u6b21\u306e\u9806\u306b\u4e26\u3076\u3002<\/p>\n<ul>\n<li><strong>\u8ee2\u9001\u5148\u306e\u4ed8\u3051\u66ff\u3048<\/strong>\uff1a\u5165\u529b\u3055\u308c\u305fURL\u304b\u3089\u5225\u306eURL\u3078\u98db\u3070\u3059\u8a2d\u5b9a\u304c\u3042\u308b\u3068\u3001\u305d\u306e\u305f\u3073\u306b\u5f80\u5fa9\u304c1\u56de\u5897\u3048\u308b<\/li>\n<li><strong>\u4f4f\u6240\u306e\u5272\u308a\u51fa\u3057<\/strong>\uff1a\u30c9\u30e1\u30a4\u30f3\u540d\u304b\u3089\u5b9f\u969b\u306e\u30b5\u30fc\u30d0\u30fc\u306e\u5c45\u5834\u6240\u3092\u8abf\u3079\u308b\u5de5\u7a0b\u3067\u3001\u521d\u56de\u306e\u8a2a\u554f\u307b\u3069\u6642\u9593\u304c\u304b\u304b\u308b<\/li>\n<li><strong>\u63a5\u7d9a\u3068\u6697\u53f7\u5316\u306e\u53d6\u308a\u6c7a\u3081<\/strong>\uff1a\u901a\u4fe1\u3092\u59cb\u3081\u308b\u524d\u306b\u3001\u76f8\u624b\u3068\u624b\u9806\u3084\u9375\u3092\u3084\u308a\u53d6\u308a\u3059\u308b\u5f80\u5fa9\u304c\u5165\u308b<\/li>\n<li><strong>\u30b5\u30fc\u30d0\u30fc\u5185\u306e\u51e6\u7406<\/strong>\uff1a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3078\u306e\u554f\u3044\u5408\u308f\u305b\u3084\u30da\u30fc\u30b8\u306e\u7d44\u307f\u7acb\u3066\u3067\u3001\u52d5\u7684\u306b\u4f5c\u308b\u30da\u30fc\u30b8\u307b\u3069\u9577\u304f\u306a\u308b<\/li>\n<\/ul>\n<p>Google\u304c\u793a\u3059\u76ee\u5b89\u306f\u3001\u5229\u7528\u8005\u306e4\u5206\u306e3\u306b\u3042\u305f\u308b\u7bc4\u56f2\u30670.8\u79d2\u4ee5\u4e0b\u3067\u3042\u308b\u30021.8\u79d2\u3092\u8d85\u3048\u308b\u3068\u9045\u3044\u307b\u3046\u306b\u5165\u308b\u3002<\/p>\n<p>\u305f\u3060\u3057TTFB\u306f\u3001Google\u304c\u5feb\u9069\u3055\u306e\u57fa\u6e96\u3068\u3057\u3066\u9078\u3093\u30603\u3064\u306e\u6307\u6a19\uff08Core Web Vitals\uff09\u306b\u306f\u542b\u307e\u308c\u306a\u3044\u3002<a href=\"https:\/\/web.dev\/articles\/ttfb\">Google\u81ea\u8eab\u304c\u300c\u5fc5\u305a\u3053\u306e\u76ee\u5b89\u3092\u6e80\u305f\u3059\u5fc5\u8981\u306f\u306a\u3044\u300d\u3068\u66f8\u3044\u3066\u3044\u308b<\/a>\u3002\u9806\u4f4d\u3092\u7af6\u3046\u6570\u5b57\u3067\u306f\u306a\u304f\u3001\u4ed6\u306e\u6307\u6a19\u304c\u9045\u3044\u7406\u7531\u3092\u63a2\u3059\u305f\u3081\u306e\u624b\u304c\u304b\u308a\u3068\u3044\u3046\u4f4d\u7f6e\u3065\u3051\u306b\u306a\u308b\u3002<\/p>\n<h2>\u8a9e\u6e90\u30fb\u63d0\u5531\u8005<\/h2>\n<p>TTFB\u3068\u3044\u3046\u8a00\u3044\u65b9\u305d\u306e\u3082\u306e\u306f\u3001\u30b5\u30fc\u30d0\u30fc\u306e\u5fdc\u7b54\u306e\u901f\u3055\u3092\u6e2c\u308b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u7528\u8a9e\u3068\u3057\u3066\u4ee5\u524d\u304b\u3089\u3042\u3063\u305f\u3002\u3053\u308c\u3092\u8868\u793a\u901f\u5ea6\u306e\u6539\u5584\u306b\u4f7f\u3046\u9053\u5177\u3078\u5909\u3048\u305f\u306e\u306f\u30012000\u5e74\u4ee3\u534a\u3070\u306eWeb\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6539\u5584\u306e\u73fe\u5834\u3067\u3042\u308b\u3002<\/p>\n<p>\u5f53\u6642\u3001\u9045\u3044\u30b5\u30a4\u30c8\u3092\u901f\u304f\u3057\u3088\u3046\u3068\u3059\u308b\u62c5\u5f53\u8005\u306e\u624b\u5143\u306b\u306f\u3001\u30da\u30fc\u30b8\u304c\u8868\u793a\u3057\u7d42\u308f\u308b\u307e\u3067\u306e\u79d2\u6570\u3068\u3044\u3046\u6570\u5b57\u304c1\u3064\u3042\u308b\u3060\u3051\u3060\u3063\u305f\u3002\u305d\u306e\u79d2\u6570\u304c\u9577\u3044\u3068\u304d\u3001\u539f\u56e0\u304c\u30b5\u30fc\u30d0\u30fc\u5074\u306b\u3042\u308b\u306e\u304b\u30d6\u30e9\u30a6\u30b6\u5074\u306b\u3042\u308b\u306e\u304b\u3092\u5206\u3051\u308b\u624b\u7acb\u3066\u304c\u306a\u3044\u3002\u7d50\u679c\u3068\u3057\u3066\u3001\u753b\u50cf\u3092\u8efd\u304f\u3059\u308b\u4f5c\u696d\u304b\u3089\u59cb\u3081\u3066\u307f\u3066\u3001\u5f53\u305f\u3089\u306a\u3051\u308c\u3070\u6b21\u3092\u8a66\u3059\u3068\u3044\u3046\u9032\u3081\u65b9\u306b\u306a\u3063\u3066\u3044\u305f\u3002<\/p>\n<p>Yahoo!\u306b\u3044\u305f <ruby>Steve<rt>\u30b9\u30c6\u30a3\u30fc\u30d6<\/rt><\/ruby> <ruby>Souders<rt>\u30b5\u30a6\u30c0\u30fc\u30b9<\/rt><\/ruby> \u3089\u304c\u72d9\u3063\u305f\u306e\u306f\u3001\u3053\u306e\u4e00\u672c\u306e\u79d2\u6570\u3092\u3001\u539f\u56e0\u306e\u5728\u308a\u304b\u3067\u5272\u308c\u308b\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u3067\u3042\u308b\u3002\u6700\u521d\u306e1\u30d0\u30a4\u30c8\u304c\u8fd4\u308b\u307e\u3067\u3092\u30b5\u30fc\u30d0\u30fc\u5074\u3001\u305d\u308c\u4ee5\u964d\u3092\u30d6\u30e9\u30a6\u30b6\u5074\u3068\u6c7a\u3081\u305f\u3002<a href=\"https:\/\/www.stevesouders.com\/blog\/2012\/02\/10\/the-performance-golden-rule\/\">\u3053\u306e\u5206\u3051\u65b9\u3067\u4e3b\u8981\u306a\u30b5\u30a4\u30c8\u3092\u6e2c\u308b\u3068<\/a>\u3001\u5229\u7528\u8005\u304c\u5f85\u3064\u6642\u9593\u306e\u3046\u30618\u301c9\u5272\u3092\u30d6\u30e9\u30a6\u30b6\u5074\u304c\u5360\u3081\u3066\u3044\u305f\u3002\u3053\u3053\u304b\u3089\u300c\u307e\u305a\u30d5\u30ed\u30f3\u30c8\u30a8\u30f3\u30c9\uff08\u30d6\u30e9\u30a6\u30b6\u5074\uff09\u304b\u3089\u624b\u3092\u4ed8\u3051\u3088\u300d\u3068\u3044\u3046\u6307\u91dd\u304c\u751f\u307e\u308c\u30012007\u5e74\u306e\u8457\u66f8\u3068\u8a08\u6e2c\u30c4\u30fc\u30eb\u3092\u901a\u3058\u3066\u5e83\u307e\u3063\u305f\u3002<\/p>\n<p>\u5272\u308a\u65b9\u304c\u5b9a\u307e\u3063\u305f\u3053\u3068\u3067\u3001TTFB\u306f\u30b5\u30fc\u30d0\u30fc\u5074\u306e\u6301\u3061\u6642\u9593\u3092\u8868\u3059\u5171\u901a\u306e\u7269\u5dee\u3057\u306b\u306a\u3063\u305f\u30022010\u5e74\u306b<a href=\"https:\/\/developers.google.com\/search\/blog\/2010\/04\/using-site-speed-in-web-search-ranking\">Google\u304c\u8868\u793a\u901f\u5ea6\u3092\u691c\u7d22\u9806\u4f4d\u306e\u8981\u7d20\u306b\u52a0\u3048\u308b\u3068\u767a\u8868\u3057\u305f<\/a>\u3053\u3068\u3067\u3001\u30a8\u30f3\u30b8\u30cb\u30a2\u4ee5\u5916\u3082\u3053\u306e\u6570\u5b57\u3092\u53e3\u306b\u3059\u308b\u3088\u3046\u306b\u306a\u308b\u3002\u5e83\u307e\u3063\u305f\u7406\u7531\u306f\u3001\u3053\u306e\u5883\u76ee\u304c\u7279\u5b9a\u306e\u8a00\u8a9e\u3084\u69cb\u6210\u306b\u7e1b\u3089\u308c\u3066\u3044\u306a\u304b\u3063\u305f\u3068\u3053\u308d\u306b\u3042\u308b\u3002\u3069\u3093\u306a\u4f5c\u308a\u306e\u30b5\u30a4\u30c8\u3067\u3082\u3001\u6700\u521d\u306e1\u30d0\u30a4\u30c8\u304c\u8fd4\u308b\u77ac\u9593\u306f\u5fc5\u305a1\u56de\u3060\u3051\u8a2a\u308c\u308b\u3002<\/p>\n<h2>\u76f4\u3059\u5834\u6240\u3092\u52d8\u3067\u6c7a\u3081\u306a\u304f\u306a\u308b<\/h2>\n<p>TTFB\u3092\u898b\u308b\u52b9\u679c\u306f\u3001\u901f\u5ea6\u6539\u5584\u306e\u4f5c\u696d\u3092\u59cb\u3081\u308b\u524d\u306b\u3001\u624b\u3092\u5165\u308c\u308b\u5834\u6240\u304c\u6c7a\u307e\u308b\u3053\u3068\u3067\u3042\u308b\u3002<\/p>\n<p>\u898b\u306a\u3044\u307e\u307e\u9032\u3081\u308b\u3068\u3001\u8868\u793a\u304c\u9045\u3044\u3068\u3044\u3046\u58f0\u306b\u5bfe\u3057\u3066\u3001\u753b\u50cf\u306e\u5727\u7e2e\u3084\u30b9\u30af\u30ea\u30d7\u30c8\u306e\u6574\u7406\u304b\u3089\u7740\u624b\u3059\u308b\u3053\u3068\u306b\u306a\u308b\u3002\u6570\u65e5\u304b\u3051\u3066\u914d\u4fe1\u3059\u308b\u30c7\u30fc\u30bf\u3092\u534a\u5206\u306b\u3057\u3066\u3082\u3001\u4f53\u611f\u304c\u307b\u3068\u3093\u3069\u5909\u308f\u3089\u306a\u3044\u3002\u539f\u56e0\u304c1\u4ef6\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u554f\u3044\u5408\u308f\u305b\u306b\u3042\u3063\u305f\u3068\u5206\u304b\u308b\u306e\u306f\u3001\u305d\u306e\u5f8c\u3067\u3042\u308b\u3002\u4f5c\u696d\u305d\u306e\u3082\u306e\u306f\u6b63\u3057\u304f\u3066\u3082\u3001\u9806\u756a\u3092\u9593\u9055\u3048\u305f\u3076\u3093\u304c\u7a7a\u632f\u308a\u306b\u306a\u308b\u3002<\/p>\n<p>\u5148\u306bTTFB\u3092\u898b\u3066\u304a\u3051\u3070\u3001\u305d\u306e\u6570\u79d2\u304c\u8fd4\u4e8b\u5f85\u3061\u306b\u5165\u3063\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u304c\u6700\u521d\u306b\u5206\u304b\u308b\u30020.8\u79d2\u3092\u5927\u304d\u304f\u8d85\u3048\u3066\u3044\u308c\u3070\u30b5\u30fc\u30d0\u30fc\u5074\u304b\u3089\u3001\u53ce\u307e\u3063\u3066\u3044\u308c\u3070\u30d6\u30e9\u30a6\u30b6\u5074\u304b\u3089\u7740\u624b\u3059\u308b\u3002\u3069\u3061\u3089\u306b\u4eba\u624b\u3092\u5272\u304f\u304b\u3092\u3001\u611f\u899a\u3067\u306f\u306a\u304f\u6570\u5b57\u3067\u6c7a\u3081\u3089\u308c\u308b\u3002<\/p>\n<p>\u52b9\u304d\u3069\u3053\u308d\u306f3\u3064\u306b\u5206\u304b\u308c\u308b\u3002\u5229\u7528\u8005\u304b\u3089\u898b\u308c\u3070\u3001\u4f55\u3082\u8868\u793a\u3055\u308c\u306a\u3044\u6642\u9593\u304c\u77ed\u304f\u306a\u308b\u3002\u958b\u767a\u30c1\u30fc\u30e0\u304b\u3089\u898b\u308c\u3070\u3001\u30d5\u30ed\u30f3\u30c8\u30a8\u30f3\u30c9\u3068\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u306e\u3069\u3061\u3089\u306e\u62c5\u5f53\u304c\u52d5\u304f\u304b\u304c\u6c7a\u307e\u308b\u3002\u4e8b\u696d\u304b\u3089\u898b\u308c\u3070\u3001Google\u304c\u8868\u793a\u901f\u5ea6\u3092\u9806\u4f4d\u306e\u8981\u7d20\u306b\u542b\u3081\u3066\u3044\u308b\u4ee5\u4e0a\u3001\u691c\u7d22\u304b\u3089\u306e\u6d41\u5165\u306b\u3082\u95a2\u308f\u3063\u3066\u304f\u308b\u3002<\/p>\n<p>\u305f\u3060\u3057\u3001TTFB\u3092\u4e0b\u3052\u308b\u3053\u3068\u81ea\u4f53\u3092\u76ee\u7684\u306b\u3059\u308b\u3068\u5916\u3059\u3002\u4e2d\u8eab\u304c\u305d\u308d\u3046\u524d\u306b\u5fdc\u7b54\u306e\u5148\u982d\u3060\u3051\u8fd4\u305b\u3070\u6570\u5b57\u306f\u4e0b\u304c\u308b\u304c\u3001\u5229\u7528\u8005\u304c\u5f85\u3064\u6642\u9593\u306f\u5909\u308f\u3089\u306a\u3044\u3002<a href=\"https:\/\/web.dev\/articles\/optimize-ttfb\">Google\u306e\u89e3\u8aac<\/a>\u3082\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u3084103 Early Hints\uff08\u5148\u306b\u8aad\u307f\u8fbc\u3080\u3079\u304d\u30d5\u30a1\u30a4\u30eb\u3092\u4e88\u544a\u3059\u308b\u4ed5\u7d44\u307f\uff09\u304c\u9045\u3044\u30b5\u30fc\u30d0\u30fc\u3092\u8986\u3044\u96a0\u3059\u53ef\u80fd\u6027\u306b\u89e6\u308c\u3066\u3044\u308b\u3002TTFB\u306f\u76ee\u6a19\u5024\u3067\u306f\u306a\u304f\u3001\u5229\u7528\u8005\u304c\u4f53\u611f\u3059\u308b\u8868\u793a\u306e\u6307\u6a19\u304c\u9045\u3044\u7406\u7531\u3092\u63a2\u3059\u3068\u304d\u306e\u5165\u53e3\u3068\u3057\u3066\u6271\u3046\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2026\/10\/ttfb01-1024x521.png\" alt=\"\" width=\"1024\" height=\"521\" class=\"alignnone size-large wp-image-39420\" srcset=\"https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2026\/10\/ttfb01-1024x521.png 1024w, https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2026\/10\/ttfb01-300x153.png 300w, https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2026\/10\/ttfb01-768x391.png 768w, https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2026\/10\/ttfb01-1536x781.png 1536w, https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2026\/10\/ttfb01.png 1766w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<h2>\u9045\u3044\u539f\u56e0\u3092\u307e\u305a2\u3064\u306b\u5272\u308b<\/h2>\n<p>TTFB\u304c\u767b\u5834\u3059\u308b\u306e\u306f\u3001\u8868\u793a\u901f\u5ea6\u306e\u6539\u5584\u306b\u7740\u624b\u3059\u308b\u904b\u7528\u306e\u6bb5\u968e\u3068\u3001\u30ea\u30ea\u30fc\u30b9\u524d\u306b\u901f\u5ea6\u3092\u78ba\u304b\u3081\u308b\u691c\u8a3c\u306e\u6bb5\u968e\u3067\u3042\u308b\u3002<\/p>\n<p>\u6b8b\u308b\u30a2\u30a6\u30c8\u30d7\u30c3\u30c8\u306f\u3001\u533a\u9593\u3054\u3068\u306e\u5185\u8a33\u3092\u4e26\u3079\u305f1\u679a\u306e\u8a18\u9332\u306b\u306a\u308b\u3002\u3053\u306e\u5185\u8a33\u304c\u3001\u305d\u306e\u307e\u307e\u6b21\u306e\u4f5c\u696d\u6307\u793a\u306b\u306a\u308b\u3002<\/p>\n<p>\u8ee2\u9001\u5148\u306e\u4ed8\u3051\u66ff\u3048\u304c2\u56de\u5165\u3063\u3066\u3044\u308c\u3070\u8a2d\u5b9a\u3092\u524a\u308b\u3002\u30b5\u30fc\u30d0\u30fc\u5185\u306e\u51e6\u7406\u304c\u9577\u3051\u308c\u3070\u554f\u3044\u5408\u308f\u305b\u3092\u898b\u76f4\u3059\u3002\u5229\u7528\u8005\u3068\u306e\u8ddd\u96e2\u304c\u9060\u3051\u308c\u3070\u3001<a href=\"https:\/\/web.dev\/articles\/optimize-ttfb\">\u5229\u7528\u8005\u306b\u8fd1\u3044\u5834\u6240\u304b\u3089\u30d5\u30a1\u30a4\u30eb\u3092\u8fd4\u3059CDN\u3092\u631f\u3080<\/a>\u3002<\/p>\n<p>\u3053\u306e\u5224\u65ad\u306f\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u3084\u30a4\u30f3\u30d5\u30e9\u306e\u62c5\u5f53\u3068\u7d44\u3093\u3067\u884c\u3046\u3002TTFB\u306f\u30d5\u30ed\u30f3\u30c8\u30a8\u30f3\u30c9\u5074\u306e\u4f5c\u696d\u3067\u306f\u307b\u3068\u3093\u3069\u52d5\u304b\u306a\u3044\u306e\u3067\u3001\u753b\u9762\u3092\u4f5c\u308b\u62c5\u5f53\u3060\u3051\u3067\u62b1\u3048\u308b\u3068\u6253\u3061\u624b\u304c\u51fa\u3066\u3053\u306a\u3044\u3002<\/p>\n<p>\u6e2c\u308a\u65b9\u3067\u3064\u307e\u305a\u304f\u3053\u3068\u304c\u591a\u3044\u3002\u81ea\u5206\u306e\u7aef\u672b\u30671\u56de\u3060\u3051\u6e2c\u3063\u305f\u6570\u5b57\u306f\u3001\u56de\u7dda\u3082\u30b5\u30fc\u30d0\u30fc\u3068\u306e\u8ddd\u96e2\u3082\u793e\u5185\u306e\u6761\u4ef6\u306b\u5bc4\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u5229\u7528\u8005\u306e\u5b9f\u611f\u3068\u305a\u308c\u308b\u30022\u56de\u76ee\u306e\u6e2c\u5b9a\u306f\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u52b9\u3044\u3066\u77ed\u304f\u51fa\u308b\u305f\u3081\u3001\u901f\u304f\u306a\u3063\u305f\u3068\u8aa4\u89e3\u3057\u3084\u3059\u3044\u3002\u5b9f\u969b\u306e\u8a2a\u554f\u304b\u3089\u96c6\u3081\u305f\u6570\u5b57\u3092\u4f7f\u3044\u3001\u5e73\u5747\u3067\u306f\u306a\u304f\u5229\u7528\u8005\u306e4\u5206\u306e3\u304c\u53ce\u307e\u308b\u5024\u3067\u898b\u308b\u3002<\/p>\n<p>\u4f1a\u8b70\u3067\u3082\u540c\u3058\u9806\u756a\u304c\u4f7f\u3048\u308b\u3002\u300c\u30b5\u30a4\u30c8\u304c\u9045\u3044\u300d\u3068\u3044\u3046\u6f20\u7136\u3068\u3057\u305f\u8b70\u984c\u304c\u51fa\u305f\u3089\u3001\u307e\u305aTTFB\u306e\u6570\u5b57\u30921\u3064\u7f6e\u304f\u3002\u3069\u3053\u3092\u76f4\u3059\u304b\u306e\u8a71\u306f\u3001\u305d\u306e\u3042\u3068\u3067\u81ea\u7136\u306b\u7247\u5074\u3078\u5bc4\u308b\u3002<\/p>\n<h2>\u95a2\u9023\u7528\u8a9e<\/h2>\n<ul>\n<li>Core Web Vitals<\/li>\n<li>CDN<\/li>\n<\/ul>\n<blockquote class=\"wp-embedded-content\" data-secret=\"CVhobdJ9Az\"><p><a href=\"https:\/\/uxdaystokyo.com\/articles\/glossary\/streaming-response\/\">\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u30ec\u30b9\u30dd\u30f3\u30b9<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"\u201c\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u30ec\u30b9\u30dd\u30f3\u30b9\u201d \u2014 UX TIMES\" src=\"https:\/\/uxdaystokyo.com\/articles\/glossary\/streaming-response\/embed\/#?secret=Mk8lgj5RQm#?secret=CVhobdJ9Az\" data-secret=\"CVhobdJ9Az\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"N3A3ZGm0HC\"><p><a href=\"https:\/\/uxdaystokyo.com\/articles\/glossary\/latency\/\">\u30ec\u30a4\u30c6\u30f3\u30b7<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"\u201c\u30ec\u30a4\u30c6\u30f3\u30b7\u201d \u2014 UX TIMES\" src=\"https:\/\/uxdaystokyo.com\/articles\/glossary\/latency\/embed\/#?secret=qApReFqrGN#?secret=N3A3ZGm0HC\" data-secret=\"N3A3ZGm0HC\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30da\u30fc\u30b8\u3092\u958b\u3044\u3066\u304b\u3089\u6700\u521d\u306e\u30c7\u30fc\u30bf\u304c\u8fd4\u308a\u59cb\u3081\u308b\u307e\u3067\u306e\u6642\u9593<\/p>\n","protected":false},"author":5,"featured_media":39422,"template":"","meta":{"_monsterinsights_skip_tracking":false,"English":"Time To First Byte","design_hint":"","footnotes":""},"glossary-category":[418],"glossary_tag":[],"class_list":["post-39418","glossary","type-glossary","status-publish","has-post-thumbnail","hentry","glossary-category-technology"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>TTFB\uff08Time To First Byte\uff09 | UX TIMES<\/title>\n<meta name=\"description\" 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\u4f1a\u8b70\u3067\u3082\u540c\u3058\u9806\u756a\u304c\u4f7f\u3048\u308b\u3002\u300c\u30b5\u30a4\u30c8\u304c\u9045\u3044\u300d\u3068\u3044\u3046\u6f20\u7136\u3068\u3057\u305f\u8b70\u984c\u304c\u51fa\u305f\u3089\u3001\u307e\u305aTTFB\u306e\u6570\u5b57\u30921\u3064\u7f6e\u304f\u3002\u3069\u3053\u3092\u76f4\u3059\u304b\u306e\u8a71\u306f\u3001\u305d\u306e\u3042\u3068\u3067\u81ea\u7136\u306b\u7247\u5074\u3078\u5bc4\u308b\u3002 \u95a2\u9023\u7528\u8a9e   Core Web Vitals  CDN  https:\/\/uxdaystokyo.com\/articles\/glossary\/streaming-response\/ https:\/\/uxdaystokyo.com\/articles\/glossary\/latency\/\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/uxdaystokyo.com\/articles\/glossary\/ttfb\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"TTFB\uff08Time To First Byte\uff09 | UX TIMES\" \/>\n<meta property=\"og:description\" content=\"TTFB\u3068\u306f\u3001\u30da\u30fc\u30b8\u306e\u9045\u3055\u304c\u30b5\u30fc\u30d0\u30fc\u306e\u8fd4\u4e8b\u5f85\u3061\u306b\u3088\u308b\u3082\u306e\u304b\u3069\u3046\u304b\u3092\u5207\u308a\u5206\u3051\u308b\u305f\u3081\u306b\u3001\u30da\u30fc\u30b8\u3092\u958b\u3044\u3066\u304b\u3089\u6700\u521d\u306e\u30c7\u30fc\u30bf\u304c\u8fd4\u308a\u59cb\u3081\u308b\u307e\u3067\u3092\u6e2c\u308b\u6307\u6a19\u3067\u3042\u308b\u3002\u8868\u793a\u901f\u5ea6\u3092\u6e2c\u308b\u6307\u6a19\u306f\u3044\u304f\u3064\u3082\u3042\u308b\u304c\u3001TTFB\u306f\u305d\u306e\u3046\u3061\u6700\u3082\u624b\u524d\u3001\u307e\u3060\u753b\u9762\u306b\u4f55\u3082\u51fa\u3066\u3044\u306a\u3044\u533a\u9593\u3060\u3051\u3092\u53d7\u3051\u6301\u3064\u3002  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TTFB\u304c\u7b54\u3048\u308b\u306e\u306f\u3001\u305d\u306e\u9045\u3055\u304c\u8fd4\u4e8b\u3092\u5f85\u3063\u3066\u3044\u308b\u6642\u9593\u306a\u306e\u304b\u3001\u8fd4\u4e8b\u304c\u6765\u305f\u3042\u3068\u306e\u6642\u9593\u306a\u306e\u304b\u3001\u3068\u3044\u3046\u5207\u308a\u5206\u3051\u3067\u3042\u308b\u3002  \u6700\u521d\u306e\u30c7\u30fc\u30bf\u3068\u306f\u3001\u30b5\u30fc\u30d0\u30fc\u304c\u8fd4\u3059\u5fdc\u7b54\u306e\u5148\u982d1\u30d0\u30a4\u30c8\u3001\u3064\u307e\u308a\u3044\u3061\u3070\u3093\u5c0f\u3055\u3044\u5358\u4f4d\u306e\u3072\u3068\u304b\u3051\u3089\u3092\u6307\u3059\u3002\u4e2d\u8eab\u304c\u5168\u90e8\u305d\u308d\u3046\u5fc5\u8981\u306f\u306a\u3044\u3002\u5148\u982d\u304c\u5c4a\u3044\u305f\u77ac\u9593\u306b\u8a08\u6e2c\u304c\u6b62\u307e\u308b\u306e\u3067\u3001TTFB\u306f\u300c\u30b5\u30fc\u30d0\u30fc\u304c\u53e3\u3092\u958b\u304f\u307e\u3067\u306e\u6642\u9593\u300d\u306b\u8fd1\u3044\u3002  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\u4f1a\u8b70\u3067\u3082\u540c\u3058\u9806\u756a\u304c\u4f7f\u3048\u308b\u3002\u300c\u30b5\u30a4\u30c8\u304c\u9045\u3044\u300d\u3068\u3044\u3046\u6f20\u7136\u3068\u3057\u305f\u8b70\u984c\u304c\u51fa\u305f\u3089\u3001\u307e\u305aTTFB\u306e\u6570\u5b57\u30921\u3064\u7f6e\u304f\u3002\u3069\u3053\u3092\u76f4\u3059\u304b\u306e\u8a71\u306f\u3001\u305d\u306e\u3042\u3068\u3067\u81ea\u7136\u306b\u7247\u5074\u3078\u5bc4\u308b\u3002 \u95a2\u9023\u7528\u8a9e   Core Web Vitals  CDN  https:\/\/uxdaystokyo.com\/articles\/glossary\/streaming-response\/ https:\/\/uxdaystokyo.com\/articles\/glossary\/latency\/\" \/>\n<meta property=\"og:url\" content=\"https:\/\/uxdaystokyo.com\/articles\/glossary\/ttfb\/\" \/>\n<meta property=\"og:site_name\" content=\"UX TIMES\" \/>\n<meta property=\"og:image\" content=\"https:\/\/uxdaystokyo.com\/articles\/wp-content\/uploads\/2026\/10\/ttfb-timeline.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1586\" \/>\n\t<meta property=\"og:image:height\" content=\"992\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data1\" content=\"8\u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/uxdaystokyo.com\\\/articles\\\/glossary\\\/ttfb\\\/\",\"url\":\"https:\\\/\\\/uxdaystokyo.com\\\/articles\\\/glossary\\\/ttfb\\\/\",\"name\":\"TTFB\uff08Time To First Byte\uff09 | UX 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