{"id":5851,"date":"2022-03-02T17:03:16","date_gmt":"2022-03-02T08:03:16","guid":{"rendered":"https:\/\/fastcoding.jp\/blog\/?p=5851"},"modified":"2022-03-14T11:45:52","modified_gmt":"2022-03-14T02:45:52","slug":"%e3%83%9a%e3%83%bc%e3%82%b8%e3%82%b9%e3%83%94%e3%83%bc%e3%83%89%e5%af%be%e7%ad%96_%e7%94%bb%e5%83%8f%e5%87%a6%e7%90%86","status":"publish","type":"post","link":"https:\/\/fastcoding.jp\/blog\/all\/frontend\/%e3%83%9a%e3%83%bc%e3%82%b8%e3%82%b9%e3%83%94%e3%83%bc%e3%83%89%e5%af%be%e7%ad%96_%e7%94%bb%e5%83%8f%e5%87%a6%e7%90%86\/","title":{"rendered":"\u3010\u30da\u30fc\u30b8\u30b9\u30d4\u30fc\u30c9\u5bfe\u7b56\u3011\u753b\u50cf\u51e6\u7406\u306b\u3088\u308b\u6539\u5584\u7b56"},"content":{"rendered":"<div class=\"the_content\"><p>\u7686\u3055\u3093\u3001\u3053\u3093\u306b\u3061\u306f\uff01<\/p>\n<p>\u30d5\u30a1\u30b9\u30c8\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u30d9\u30c8\u30ca\u30e0\u306e\u30d5\u30ed\u30f3\u30c8\u30a8\u30f3\u30c9\u958b\u767a\u30c1\u30fc\u30e0\u306eNathan\u3067\u3059\u3002<\/p>\n<p><a href=\"https:\/\/fastcoding.jp\/blog\/all\/frontend\/%e3%83%9a%e3%83%bc%e3%82%b8%e3%82%b9%e3%83%94%e3%83%bc%e3%83%89%e5%af%be%e7%ad%96_lazy-loading_%e9%81%85%e5%bb%b6%e8%aa%ad%e3%81%bf%e8%be%bc%e3%81%bf\/\">\u524d\u56de\u306f\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u3092\u6d3b\u7528\u3057\u305f\u30da\u30fc\u30b8\u30b9\u30d4\u30fc\u30c9\u30b9\u30b3\u30a2\u306e\u5411\u4e0a\u306b\u3064\u3044\u3066\u8a18\u8ff0\u3044\u305f\u3057\u307e\u3057\u305f\u3002<\/a><br \/>\n\u4eca\u56de\u306f\u753b\u50cf\u51e6\u7406\u306b\u3088\u308b\u30da\u30fc\u30b8\u30b9\u30d4\u30fc\u30c9\u30b9\u30b3\u30a2\u306e\u5411\u4e0a\u306b\u3064\u3044\u3066\u66f8\u3044\u3066\u307f\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<br \/>\n\u753b\u50cf\u51e6\u7406\u3060\u3051\u3067\u3059\u306e\u3067\u3001HTML\u3084JavaScript\u3092\u4f7f\u3046\u3053\u3068\u304c\u7121\u304f\u3001\u3068\u3066\u3082\u5358\u7d14\u306a\u3053\u3068\uff08\u3060\u304b\u3089\u52b9\u679c\u304c\u3042\u308b\u306e\uff1f\uff09\u3068\u601d\u3046\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u5b9f\u969b\u5f0a\u793e\u3067\u5bfe\u7b56\u3092\u3059\u308bWeb\u30b5\u30a4\u30c8\u306e\u307b\u3068\u3093\u3069\u306f\u3001\u3053\u306e\u5bfe\u7b56\u3067\u6570\u5341\u70b9\u306e\u30b9\u30b3\u30a2\u30a2\u30c3\u30d7\u304c\u3067\u304d\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u8272\u3005\u306a\u30da\u30fc\u30b8\u30b9\u30d4\u30fc\u30c9\u5bfe\u7b56\u7528\u306e\u753b\u50cf\u51e6\u7406\u306e\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3044\u305f\u3057\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/kv.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-5852 size-full\" src=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/kv.png\" alt=\"\" width=\"860\" height=\"243\" srcset=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/kv.png 860w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/kv-300x85.png 300w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/kv-768x217.png 768w\" sizes=\"(max-width: 860px) 100vw, 860px\" \/><\/a><\/p>\n<p style=\"text-align: center\"><a href=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/kv.png\"><em>\u30bd\u30fc\u30b9\uff1ahttps:\/\/www.kindpng.com\/imgv\/TRomTim_jpg-gif-png-and-svg-example-images-png\/<\/em><\/a><\/p>\n<p>&nbsp;<\/p>\n<h2>1\uff0e\u753b\u50cf\u306e\u6a2a\u5e45\u3068\u9ad8\u3055\u3092\u5fc5\u305a\u6307\u5b9a\u3059\u308b\u3053\u3068\u3002<\/h2>\n<p>\u753b\u50cf\u306e\u30b5\u30a4\u30ba\u306f\u3001CLS\uff08Cumulative Layout Shift &#8211; \u7d2f\u7a4d\u30ec\u30a4\u30a2\u30a6\u30c8\u30b7\u30d5\u30c8\u3000\u8aad\u307f\u8fbc\u307f\u4e2d\u306e\u8868\u793a\u30da\u30fc\u30b8\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u30ec\u30a4\u30a2\u30a6\u30c8\u306e\u5b89\u5b9a\u6027\u3068\u5909\u5316\u3092\u6e2c\u5b9a\u3059\u308b\uff09\u306b\u3042\u308b\u7a0b\u5ea6\u306e\u5f71\u97ff\u304c\u3042\u308a\u307e\u3059\u3002CLS\u304c\u5b89\u5b9a\u3057\u306a\u3044\u3068\u3001PSI\u30b9\u30b3\u30a2\u3082\u5927\u304d\u304f\u6e1b\u70b9\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002<br \/>\n\u305d\u306e\u305f\u3081\u3001\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u5185\u306e\u753b\u50cf\u30b5\u30a4\u30ba\u306f\u5fc5\u305a\u6a2a\u5e45\u3068\u9ad8\u3055\u3092\u6307\u5b9a\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p><a href=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5853 size-full aligncenter\" src=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/1.png\" alt=\"\" width=\"387\" height=\"22\" srcset=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/1.png 387w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/1-300x17.png 300w\" sizes=\"(max-width: 387px) 100vw, 387px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>\u7279\u306b\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u30ec\u30a4\u30a2\u30a6\u30c8\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u3044\u304f\u3064\u304b\u306e\u7559\u610f\u70b9\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u4ee3\u8868\u7684\u306a\u3082\u306e\u3092\u8a18\u8f09\u3044\u305f\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>&lt;img&gt;\u30bf\u30b0\u3067\u3000\u201cwidth\u201d \u3068 \u201cheight\u201d\u306e\u30b5\u30a4\u30ba\u3092\u30d1\u30bd\u30b3\u30f3\u753b\u9762\uff08PC\uff09\u3067\u8868\u793a\u3059\u308b\u3053\u3068\u3092\u5fc5\u305a\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3002<\/li>\n<li>\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u306a\u753b\u9762\u30b5\u30a4\u30ba\u306e\u5834\u5408\u3001\u30ad\u30fc\u30d3\u30b8\u30e5\u30a2\u30eb\u30a4\u30e1\u30fc\u30b8\u8981\u7d20\u306e\u89aa\u8981\u7d20\u306b\u201cheight\u201d\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3092\u5fc5\u305a\u6ce8\u610f\u3059\u308b\u3053\u3068\uff08\u5834\u5408\u306b\u3088\u3063\u3066\u306f\u300cvw &#8211; viewport width\u300d\u307e\u305f\u306f\u300crem\u300d\u5358\u4f4d\u3092\u4f7f\u7528\uff09\u3002<\/li>\n<\/ul>\n<p><a href=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-5854 size-full\" src=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/2.png\" alt=\"\" width=\"1804\" height=\"726\" srcset=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/2.png 1804w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/2-300x121.png 300w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/2-1024x412.png 1024w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/2-768x309.png 768w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/2-1536x618.png 1536w\" sizes=\"(max-width: 1804px) 100vw, 1804px\" \/><\/a><\/p>\n<p>\u89aa\u8981\u7d20\u306b\u30af\u30e9\u30b9\u304c\u306a\u3044\u5834\u5408\u306f\u3001\u30af\u30e9\u30b9\u3092\u8ffd\u52a0\u3057\u3066\u3001\u753b\u50cf\u306e\u9ad8\u3055\u3068\u89aa\u8981\u7d20\u306e\u9ad8\u3055\u3092\u4e00\u81f4\u3059\u308b\u3088\u3046\u306b\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/3.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-5855 size-full\" src=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/3.png\" alt=\"\" width=\"399\" height=\"729\" srcset=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/3.png 399w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/3-164x300.png 164w\" sizes=\"(max-width: 399px) 100vw, 399px\" \/><\/a> <a href=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/4.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5856 size-full\" src=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/4.png\" alt=\"\" width=\"369\" height=\"736\" srcset=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/4.png 369w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/4-150x300.png 150w\" sizes=\"(max-width: 369px) 100vw, 369px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<h2>2\uff0e\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u5727\u7e2e\u30c4\u30fc\u30eb\u3067\u753b\u50cf\u30b5\u30a4\u30ba\u3092\u6700\u9069\u5316\uff1a<\/h2>\n<p>\u30da\u30fc\u30b8\u30b9\u30d4\u30fc\u30c9\u30b9\u30b3\u30a2\u306b\u3068\u3063\u3066\u3001\u753b\u50cf\u306e\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u306f\u5c0f\u3055\u3051\u308c\u3070\u5c0f\u3055\u3044\u307b\u3069\u826f\u3044\u306e\u3067\u3059\u304c\u3001\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u5c0f\u3055\u304f\u3059\u308c\u3070\u3001\u305d\u306e\u5206\u753b\u8cea\u3082\u843d\u3061\u3066\u3057\u307e\u3044\u307e\u3059\u3002<br \/>\n\u3088\u3063\u3066HTML\u30b3\u30fc\u30c0\u30fc\u306f\u7a0b\u3088\u3044\u753b\u8cea\u3092\u7dad\u6301\u3057\u305f\u307e\u307e\u3001\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u3067\u304d\u308b\u3060\u3051\u5c0f\u3055\u304f\u3059\u308b\u3053\u3068\u3092\u8a66\u307f\u308b\u308f\u3051\u3067\u3059\u304c\u3001\u4eba\u9593\u306e\u624b\u4f5c\u696d\u3067\u306f\u9650\u754c\u304c\u3042\u308a\u3001\u5927\u304d\u306a\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u306e\u307e\u307e\u753b\u50cf\u3092\u5229\u7528\u3057\u3066\u3044\u308bWeb\u30b5\u30a4\u30c8\u3082\u591a\u3005\u898b\u53d7\u3051\u3089\u308c\u307e\u3059\u3002<br \/>\n\u5f0a\u793e\u3067\u306f <a href=\"https:\/\/kraken.io\/\" target=\"_blank\" rel=\"noopener\">kraken.io<\/a> \u3068\u3044\u3046\u30c4\u30fc\u30eb\u3092\u7528\u3044\u3066\u3001\u753b\u8cea\u3092\u307b\u3069\u3088\u304f\u30ad\u30fc\u30d7\u3057\u305f\u307e\u307e\u3001\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u6700\u5c0f\u5316\u3059\u308b\u3088\u3046\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\u3053\u306e\u624b\u306e\u30c4\u30fc\u30eb\u306f\u7121\u6570\u306b\u3042\u308a\u307e\u3059\u304c\u3001\u3044\u304f\u3064\u304b\u306e\u30c4\u30fc\u30eb\u3092\u4f7f\u3063\u305f\u7d50\u679c\u3001\u3053\u306e\u30c4\u30fc\u30eb\u304c\u4eca\u306e\u3068\u3053\u308d\u6700\u9069\u3067\u306f\u306a\u3044\u304b\u3068\u601d\u3044\u307e\u3059\u3002<br \/>\n\u958b\u767a\u74b0\u5883\uff08Grunt\u3084Gulp\u7b49\u306e\u30bf\u30b9\u30af\u30e9\u30f3\u30ca\u30fc\uff09\u306b\u53d6\u308a\u8fbc\u3093\u3067\u5229\u7528\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u308b\u306e\u3067\u3001\u5927\u5909\u304a\u3059\u3059\u3081\u3067\u3059\u3002<\/p>\n<p style=\"text-align: center\"><a href=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/10.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-5857 size-full\" src=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/10.png\" alt=\"\" width=\"1899\" height=\"841\" srcset=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/10.png 1899w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/10-300x133.png 300w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/10-1024x453.png 1024w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/10-768x340.png 768w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/10-1536x680.png 1536w\" sizes=\"(max-width: 1899px) 100vw, 1899px\" \/><\/a> <a href=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/11-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-5860 size-full\" src=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/11-1.png\" alt=\"\" width=\"1014\" height=\"148\" srcset=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/11-1.png 1014w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/11-1-300x44.png 300w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/11-1-768x112.png 768w\" sizes=\"(max-width: 1014px) 100vw, 1014px\" \/><\/a><br \/>\n<em>\u30bd\u30fc\u30b9\uff1a<a href=\"https:\/\/kraken.io\/\" target=\"_blank\" rel=\"noopener\">https:\/\/kraken.io\/<\/a><\/em><\/p>\n<p>&nbsp;<\/p>\n<p>\u4ee5\u4e0b\u306f1\u4f8b\u3067\u3059\u304c\u3001\u753b\u8cea\u3084\u30d5\u30a1\u30a4\u30eb\u5f62\u5f0f\u306b\u3082\u3088\u308a\u307e\u3059\u304c\u3001\u30c4\u30fc\u30eb\u3092\u4f7f\u3046\u524d\u5f8c\u3067\u306f30\uff5e50\uff05\u7a0b\u5ea6\u306e\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u306e\u958b\u304d\u304c\u51fa\u308b\u3053\u3068\u304c\u591a\u304f\u3001\u5927\u5909\u6709\u7528\u306a\u30c4\u30fc\u30eb\u3067\u3059\u3002<\/p>\n<p>\u4f8b\uff09<br \/>\nOriginal size: 724.18 KB<\/p>\n<p>Kraked size: 467.42 KB<\/p>\n<p>Savings: 256.76 KB<\/p>\n<p>% Savings: 35.46 %<\/p>\n<p>&nbsp;<\/p>\n<h2>3\uff0eWebP\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3067\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u753b\u50cf\u3092\u6700\u9069\u5316<\/h2>\n<p>WebP\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3068\u306f\u3001Google\u304c\u958b\u767a\u3057\u305fWeb\u30b5\u30a4\u30c8\u5411\u3051\u306e\u753b\u50cf\u30d5\u30a1\u30a4\u30eb\u306e\u5f62\u5f0f\u3092\u610f\u5473\u3057\u307e\u3059\u3002WebP\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u30d6\u30e9\u30a6\u30b6\u306e\u5834\u5408\u306b\u306f\u3001WebP\u753b\u50cf\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30da\u30fc\u30b8\u30b9\u30d4\u30fc\u30c9\u30b9\u30b3\u30a2\u304c\u4e0a\u304c\u308a\u307e\u3059\u3002<br \/>\n\u5177\u4f53\u7684\u306b\u306f\u3001\u753b\u50cf\u306e\u73fe\u5728\u306e\u5f62\u5f0f\u306b\u300c.webp\u300d\u3092\u8ffd\u52a0\u3057\u3001\u30b5\u30a4\u30c8\u304c\u300c.htaccess\u300d\u30d5\u30a1\u30a4\u30eb\u3092\u4ecb\u3057\u3066webp\u753b\u50cf\u3092\u53d7\u4fe1\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p><em>\u4f8b\u3048\u3070\uff1a<\/em><\/p>\n<p>\u53e4\u3044\u753b\u50cf\uff1aimage.jpg<\/p>\n<p>\u65b0\u3057\u3044\u753b\u50cf\uff1aimage.jpg.webp<\/p>\n<p>&nbsp;<\/p>\n<p><em>\u305d\u3057\u3066\u3053\u308c\u304c\u3001\u4e0a\u8a18\u306e\u30d5\u30a1\u30a4\u30eb\u540d\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u5834\u5408\u306e\u300c.htaccess\u300d\u30d5\u30a1\u30a4\u30eb\u306e\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/em><\/p>\n<p><a href=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/12.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5859 size-full aligncenter\" src=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/12.png\" alt=\"\" width=\"543\" height=\"357\" srcset=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/12.png 543w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/12-300x197.png 300w\" sizes=\"(max-width: 543px) 100vw, 543px\" \/><\/a><\/p>\n<p>\u300c.htaccess\u300d\u30d5\u30a1\u30a4\u30eb\u3092\u300cindex.html\u300d\u30d5\u30a1\u30a4\u30eb\u3068\u540c\u3058\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u30ec\u30d9\u30eb\u306b\u914d\u7f6e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u3053\u308c\u306f\u3001Chrome Dev Tools\uff08Chrome\u306e\u30c7\u30d9\u30ed\u30c3\u30d1\u30fc\u30c4\u30fc\u30eb\uff09\u306e[\u30cd\u30c3\u30c8\u30ef\u30fc\u30af]\u30bf\u30d6\u306b\u8868\u793a\u3055\u308c\u308b\u7d50\u679c\u3067\u3059\u3002<\/p>\n<p><a href=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/5.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5861 size-full aligncenter\" src=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/5.png\" alt=\"\" width=\"413\" height=\"354\" srcset=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/5.png 413w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/5-300x257.png 300w\" sizes=\"(max-width: 413px) 100vw, 413px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>HTML\u30d5\u30a1\u30a4\u30eb\u306e\u5143\u306e\u753b\u50cf\u5f62\u5f0f\u304c\u4fdd\u6301\u3055\u308c\uff08\u5de6\u5074\u306e\u30bb\u30eb\uff09\u3001[\u30bf\u30a4\u30d7]\u30bb\u30af\u30b7\u30e7\u30f3\uff08\u53f3\u5074\u306e\u30bb\u30eb\uff09\u306e\u30a6\u30a8\u30d6\u30da\u30fc\u30b8\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u65b0\u3057\u3044\u300c.webp\u300d\u5f62\u5f0f\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3><em>\u3088\u304f\u3042\u308b\u3054\u8cea\u554f<\/em><\/h3>\n<p><strong>\u8cea\u554f\uff1a<\/strong>\u300cindex.html\u300d\u30d5\u30a1\u30a4\u30eb\u306b\u753b\u50cf\u30d5\u30a1\u30a4\u30eb\u306e\u65b0\u3057\u3044\u753b\u50cf\u5f62\u5f0f\u3092\u76f4\u63a5\u8ffd\u52a0\u3057\u306a\u3044\u306e\u306f\u306a\u305c\u3067\u3059\u304b\uff1f<\/p>\n<p><strong>\u7b54\u3048\uff1a<\/strong>\u3059\u3079\u3066\u306e\u30d6\u30e9\u30a6\u30b6\u307e\u305f\u306f\u30c7\u30d0\u30a4\u30b9\u304c\u300c.webp\u300d\u753b\u50cf(e.g. I.E, Safari)\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u306e\u3067\u3001\u300cindex.html\u300d\u306e\u4e2d\u306b\u753b\u50cf\u30d5\u30a1\u30a4\u30eb\u5f62\u5f0f\u3092\u76f4\u63a5\u300c.webp\u300d\u62e1\u5f35\u5b50\u306b\u8ffd\u52a0\u3059\u308b\u3053\u3068\u306f\u304a\u3059\u3059\u3081\u3057\u307e\u305b\u3093\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2>4\uff0e\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u3000-\u3000\u975e\u8868\u793a\u753b\u50cf\u306e\u300c\u9045\u5ef6\u300d\u8aad\u307f\u8fbc\u307f<\/h2>\n<p><a href=\"https:\/\/kraken.io\/\" target=\"_blank\" rel=\"noopener\">1\u3064\u524d\u306e\u8a18\u4e8b\u3068\u88ab\u308a\u307e\u3059\u304c<\/a>\u3001\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u306f\u3001\u30d6\u30e9\u30a6\u30b6\u304c\u30e6\u30fc\u30b6\u30fc\u306b\u7d50\u679c\u3092\u8fd4\u3059\u524d\u306b\u3001\u540c\u6642\u306b\u591a\u304f\u306eWeb\u30da\u30fc\u30b8\u306e\u753b\u50cf\u3092\u8aad\u307f\u8fbc\u3080\u3053\u3068\u3092\u8efd\u6e1b\u3057\u307e\u3059\u3002\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u306f\u3001\u30ea\u30bd\u30fc\u30b9\u306e\u7bc0\u7d04\u3001\u30e6\u30fc\u30b6\u30fc\u30a8\u30af\u30b9\u30da\u30ea\u30a8\u30f3\u30b9\u306e\u5411\u4e0a\u3001\u30da\u30fc\u30b8\u30b9\u30d4\u30fc\u30c9\u30b9\u30b3\u30a2\u306e\u5411\u4e0a\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n<p>\u6b21\u306e\u3088\u3046\u306b&lt;img&gt;\u30bf\u30b0\u306bloading = &#8220;lazy&#8221;\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3067\u3001Web\u30da\u30fc\u30b8\u306e\u753b\u50cf\u306b\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/6.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5862 size-full aligncenter\" src=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/6.png\" alt=\"\" width=\"366\" height=\"23\" srcset=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/6.png 366w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/6-300x19.png 300w\" sizes=\"(max-width: 366px) 100vw, 366px\" \/><\/a><\/p>\n<p><strong>\u6ce8\u610f\uff1a<\/strong>ATF\uff08Above The Fold\uff09\u306b\u5c5e\u3059\u308b\u753b\u50cf\u8981\u7d20\u306b\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u3092\u8a2d\u5b9a\u3057\u306a\u3044\u3067\u304f\u3060\u3055\u3044\u3002\u306a\u305c\u306a\u3089ATF\u9818\u57df\u306f\u9045\u5ef6\u305b\u305a\u306b\u5373\u6642\u306b\u8aad\u307f\u8fbc\u3080\u3053\u3068\u304c\u5fc5\u8981\u3060\u304b\u3089\u3067\u3059\u3002<\/p>\n<p><a href=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/13.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-5863 size-full\" src=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/13.png\" alt=\"\" width=\"940\" height=\"788\" srcset=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/13.png 940w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/13-300x251.png 300w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/13-768x644.png 768w\" sizes=\"(max-width: 940px) 100vw, 940px\" \/><\/a><\/p>\n<h2>5\uff0e\u9069\u5207\u306a\u30b5\u30a4\u30ba\u306e\u753b\u50cf<\/h2>\n<p>\u5fc5\u8981\u306a\u8868\u793a\u30b5\u30a4\u30ba\u306b\u5bfe\u3057\u3066\u5927\u304d\u3059\u304e\u308b\u753b\u50cf\u3092\u8a2d\u5b9a\u3059\u308b\u306e\u306f\u3001PSI\u30b9\u30b3\u30a2\u306b\u60aa\u5f71\u97ff\u3092\u53ca\u307c\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3092\u56de\u907f\u3059\u308b\u65b9\u6cd5\u306f\u3001\u5143\u306e\u753b\u50cf\u306e\u30b5\u30a4\u30ba\u3092\u7e2e\u5c0f\u3057\u3066\u3001Web\u30da\u30fc\u30b8\u306b\u5fc5\u8981\u306a\u753b\u50cf\u30b5\u30a4\u30ba\u3068\u4e00\u81f4\u3055\u305b\u308b\u3053\u3068\u3067\u3059\u3002\u3053\u306e\u4f5c\u696d\u306fPhotoshop\u7b49\u306e\u753b\u50cf\u7de8\u96c6\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3067\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/7.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-5864 size-full\" src=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/7.png\" alt=\"\" width=\"1050\" height=\"777\" srcset=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/7.png 1050w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/7-300x222.png 300w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/7-1024x758.png 1024w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/7-768x568.png 768w\" sizes=\"(max-width: 1050px) 100vw, 1050px\" \/><\/a> <a href=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/8.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5865 size-full\" src=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/8.png\" alt=\"\" width=\"1702\" height=\"891\" srcset=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/8.png 1702w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/8-300x157.png 300w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/8-1024x536.png 1024w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/8-768x402.png 768w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/8-1536x804.png 1536w\" sizes=\"(max-width: 1702px) 100vw, 1702px\" \/><\/a> <a href=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/9.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5866 size-full\" src=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/9.png\" alt=\"\" width=\"1664\" height=\"875\" srcset=\"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/9.png 1664w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/9-300x158.png 300w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/9-1024x538.png 1024w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/9-768x404.png 768w, https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/02\/9-1536x808.png 1536w\" sizes=\"(max-width: 1664px) 100vw, 1664px\" \/><\/a><\/p>\n<p>\u4e0a\u8a18\u306e\u4f8b\u306f\u3001\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u753b\u9762\u306e\u753b\u50cf\u30b5\u30a4\u30ba\u3092\u7e2e\u5c0f\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u30c7\u30b9\u30af\u30c8\u30c3\u30d7\u30b5\u30a4\u30ba\u306e\u753b\u50cf\u306b\u3082\u5f53\u3066\u306f\u307e\u308a\u307e\u3059\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u3054\u89a7\u306e\u3068\u304a\u308a\u3001\u753b\u50cf\u51e6\u7406\u306f\u30da\u30fc\u30b8\u306e\u8aad\u307f\u8fbc\u307f\u901f\u5ea6\u3092\u5927\u5e45\u306b\u5411\u4e0a\u3055\u305b\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u5f85\u305f\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u6642\u9593\u3092\u77ed\u7e2e\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002\u3059\u3050\u306b\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u3067\u554f\u984c\u3092\u89e3\u6c7a\u3057\u3066\u6539\u5584\u3057\u307e\u3057\u3087\u3046\uff01<\/p>\n<p>&nbsp;<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>\u7686\u3055\u3093\u3001\u3053\u3093\u306b\u3061\u306f\uff01 \u30d5\u30a1\u30b9\u30c8\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u30d9\u30c8\u30ca\u30e0\u306e\u30d5\u30ed\u30f3\u30c8\u30a8\u30f3\u30c9\u958b\u767a\u30c1\u30fc\u30e0\u306eNathan\u3067\u3059\u3002 \u524d\u56de\u306f\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u3092\u6d3b\u7528\u3057\u305f\u30da\u30fc\u30b8\u30b9\u30d4\u30fc\u30c9\u30b9\u30b3\u30a2\u306e\u5411\u4e0a\u306b\u3064\u3044\u3066\u8a18\u8ff0\u3044\u305f\u3057\u307e\u3057\u305f\u3002 \u4eca\u56de\u306f\u753b\u50cf\u51e6\u7406\u306b\u3088\u308b\u30da\u30fc\u30b8\u30b9\u30d4\u30fc\u30c9\u30b9\u30b3\u30a2 [&hellip;]<\/p>\n","protected":false},"author":18,"featured_media":6005,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"enabled":false},"version":2}},"categories":[13,27],"tags":[344,250],"class_list":["post-5851","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-frontend","category-seo","tag-psi","tag-250"],"acf":[],"aioseo_notices":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/fastcoding.jp\/blog\/wp-content\/uploads\/2022\/03\/wepik-2022214-1130-1.png","jetpack_sharing_enabled":true,"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/fastcoding.jp\/blog\/wp-json\/wp\/v2\/posts\/5851","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fastcoding.jp\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fastcoding.jp\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fastcoding.jp\/blog\/wp-json\/wp\/v2\/users\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/fastcoding.jp\/blog\/wp-json\/wp\/v2\/comments?post=5851"}],"version-history":[{"count":19,"href":"https:\/\/fastcoding.jp\/blog\/wp-json\/wp\/v2\/posts\/5851\/revisions"}],"predecessor-version":[{"id":6008,"href":"https:\/\/fastcoding.jp\/blog\/wp-json\/wp\/v2\/posts\/5851\/revisions\/6008"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/fastcoding.jp\/blog\/wp-json\/wp\/v2\/media\/6005"}],"wp:attachment":[{"href":"https:\/\/fastcoding.jp\/blog\/wp-json\/wp\/v2\/media?parent=5851"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fastcoding.jp\/blog\/wp-json\/wp\/v2\/categories?post=5851"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fastcoding.jp\/blog\/wp-json\/wp\/v2\/tags?post=5851"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}