{"id":9739,"date":"2018-11-21T07:15:10","date_gmt":"2018-11-20T22:15:10","guid":{"rendered":"https:\/\/www.suzukikenichi.com\/blog\/?p=9739"},"modified":"2018-12-23T07:35:00","modified_gmt":"2018-12-22T22:35:00","slug":"speed-essentials-key-techniques-for-fast-websites","status":"publish","type":"post","link":"https:\/\/www.suzukikenichi.com\/blog\/speed-essentials-key-techniques-for-fast-websites\/","title":{"rendered":"\u30e2\u30d0\u30a4\u30eb\u30a6\u30a7\u30d6\u306e\u30b9\u30d4\u30fc\u30c9\u30a2\u30c3\u30d7\u306b\u4e0d\u53ef\u6b20\u306a\u306e\u306f \u753b\u50cf\u30fbJS\u30fb\u30d5\u30a9\u30f3\u30c8 \u306e\u6700\u9069\u5316 #ChromeDevSummit"},"content":{"rendered":"<p class=\"p20-b al-r small\">[\u30ec\u30d9\u30eb: \u4e2d\u7d1a]<\/p>\n<p><a href=\"https:\/\/www.suzukikenichi.com\/blog\/making-modern-web-content-discoverable-for-search\/\">\u6628\u65e5<\/a>\u3068<a href=\"https:\/\/www.suzukikenichi.com\/blog\/making-modern-web-content-discoverable-for-search\/\">\u304a\u3068\u3068\u3044<\/a>\u306b\u7d9a\u3044\u3066\u3001\u4eca\u65e5\u3082 <a href=\"http:\/\/Chrome Dev Summit\">Chrome Dev Summit<\/a> 2018 \u306e\u30bb\u30c3\u30b7\u30e7\u30f3\u30ec\u30dd\u30fc\u30c8\u3092\u304a\u5c4a\u3051\u3057\u307e\u3059\u3002<\/p>\n<p>\u30bb\u30c3\u30b7\u30e7\u30f3\u306e\u30bf\u30a4\u30c8\u30eb\u306f \u201cSpeed Essentials: Key Techniques for Fast Websites\u201d \u3067\u3059\u3002<br \/>\u6628\u65e5\u30ec\u30dd\u30fc\u30c8\u3057\u305f\u30bb\u30c3\u30b7\u30e7\u30f3\u3068\u540c\u3058\u3088\u3046\u306b\u30e2\u30d0\u30a4\u30eb\u30a6\u30a7\u30d6\u306e\u9ad8\u901f\u5316\u304c\u30c6\u30fc\u30de\u3067\u3059\u3002<br \/>\u3057\u304b\u3057\u3001\u3053\u3061\u3089\u306f\u3088\u308a\u5b9f\u8df5\u7684\u306a\u5185\u5bb9\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<br \/>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6539\u5584\u306b\u975e\u5e38\u306b\u5f79\u7acb\u3064\u30c6\u30af\u30cb\u30c3\u30af\u304c\u6e80\u8f09\u3067\u3059\u3002<\/p>\n<div class=\"p60-b\">\n<img loading=\"lazy\" decoding=\"async\" itemprop=\"image\" src=\"https:\/\/www.suzukikenichi.com\/images\/kate-hempenius-cds2018.jpg\" alt=\"Kate Hempenius talking at Chrome Dev Summit 2018\" width=\"1000\" height=\"673\" \/><\/div>\n<h2>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6539\u5584\u306e\u512a\u5148\u5bfe\u8c61\u306f\u753b\u50cf\u3068JS\u3001\u30d5\u30a9\u30f3\u30c8\u306e3\u3064<\/h2>\n<p>\u30e2\u30d0\u30a4\u30eb\u30a6\u30a7\u30d6\u3067 1 \u30da\u30fc\u30b8\u3042\u305f\u308a\u30c7\u30fc\u30bf\u91cf\u304c\u591a\u3044\u30ea\u30bd\u30fc\u30b9\u306f\u6b21\u306e\u9806\u756a\uff08<a href=\"https:\/\/httparchive.org\/\">HTTP Archive<\/a> \u8abf\u3079\uff09<\/p>\n<ol>\n<li>\u753b\u50cf (\u7d04 500 KB)<\/li>\n<li>JavaScript (\u7d04 380 KB)<\/li>\n<li>\u30d5\u30a9\u30f3\u30c8 (\u7d04 80 KB)<\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" itemprop=\"image\" src=\"https:\/\/www.suzukikenichi.com\/images\/Speed_Essentials1.png\" alt=\"\u30e2\u30d0\u30a4\u30eb\u30a6\u30a7\u30d6\u3067 1 \u30da\u30fc\u30b8\u3042\u305f\u308a\u30c7\u30fc\u30bf\u91cf\u304c\u591a\u3044\u30ea\u30bd\u30fc\u30b9\" width=\"832\" height=\"585\" \/><\/p>\n<p class=\"p40-b\">\u3053\u306e 3 \u3064\u306f <a href=\"https:\/\/addyosmani.com\/blog\/performance-budgets\/\">Performance Budget<\/a>\uff08\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9 \u30d0\u30b8\u30a7\u30c3\u30c8\uff09\u306b\u304a\u3044\u3066\u3082\u3001\u6700\u3082\u8003\u616e\u3059\u3079\u304d\u8981\u56e0\u306b\u306a\u3063\u3066\u3044\u308b\u3002<\/p>\n<h2>\u753b\u50cf<\/h2>\n<p>\u753b\u50cf\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u3067\u4e00\u756a\u91cd\u8981\u3002\u6700\u9069\u5316\u3067\u304d\u3066\u3044\u306a\u3044\u30b5\u30a4\u30c8\u304c\u5b9f\u306b\u591a\u3044\u3002<\/p>\n<p>\u753b\u50cf\u3092\u6700\u9069\u5316\u3059\u308b\u624b\u6bb5\u306b\u306f\u6b21\u306e\u3088\u3046\u306a\u3082\u306e\u304c\u3042\u308b\u3002<\/p>\n<ul>\n<li>\u9069\u5207\u306a\u30d5\u30a9\u30fc\u30de\u30c3\u30c8<\/li>\n<li>\u9069\u5207\u306a\u5727\u7e2e<\/li>\n<li>\u9069\u5207\u306a\u30b5\u30a4\u30ba\u30fb\u5bc6\u96c6\u5ea6<\/li>\n<li>\u5fc5\u8981\u306a\u3068\u304d\u3060\u3051\u8aad\u307f\u8fbc\u3080 (Lazy-load)<\/li>\n<\/ul>\n<p>\u3053\u308c\u3089\u306e\u65bd\u7b56\u306f\u3001\u6642\u9593\u3068\u52b4\u529b\u3092\u524a\u6e1b\u3059\u308b\u305f\u3081\u306b\u81ea\u52d5\u5316\u3057\u3066\u30b7\u30b9\u30c6\u30e0\u7684\u306b\u5b9f\u884c\u3059\u3079\u304d\u3002<\/p>\n<h3>\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8<\/h3>\n<p>\u753b\u50cf\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306f\u76ee\u7684\u306b\u5fdc\u3058\u3066\u9078\u629e\u3059\u308b\u3002<\/p>\n<h3>\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3 GIF<\/h3>\n<p>\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3 GIF \u306f\u30b5\u30a4\u30ba\u304c\u5927\u304d\u3044\u306e\u3067\u3001MPEG-4 (MP4) \u3092\u4f7f\u3046\u2015\u2015\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3 GIF \u306f MP 4 \u306e 5 \u301c 20 \u500d\u30b5\u30a4\u30ba\u304c\u5927\u304d\u304f\u306a\u308b\uff08\u5b9f\u306f Twitter \u3067\u306f\u3001\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3 GIF \u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u3068 MP 4 \u306b\u81ea\u52d5\u7684\u306b\u5909\u63db\u3055\u308c\u3066\u3044\u308b\uff09<\/p>\n<p>\u305f\u3068\u3048\u3070\u3001<a href=\"https:\/\/www.ffmpeg.org\/\">ffmeg<\/a> \u3092\u4f7f\u3046\u3068\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u3067\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3 GIF \u3092 MP 4 \u306b\u5909\u63db\u3067\u304d\u308b\u3002<br \/>\n<code>$ ffmeg -i dog.gif<\/code><\/p>\n<p>\u5909\u63db\u5f8c\u306f HTML \u30bf\u30b0\u3092 <code><\/code><code>&lt;img&gt;<\/code> \u30bf\u30b0\u304b\u3089 <code>&lt;video&gt;<\/code> \u30bf\u30b0\u306b\u66f4\u65b0\u3059\u308b\u3002<\/p>\n<pre style=\"overflow-x: auto\"><code class=\"green\">&lt;video autoplay loop muted playsinline&gt;\r\n    &lt;source src=\"dog.mp4\" type=\"video\/mp4\"&gt; \r\n&lt;\/video&gt;<\/code><\/pre>\n<p class=\"p30-t\">MP 4 \u52d5\u753b\u3092\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3 GIF \u306e\u3088\u3046\u306b\u3001\u81ea\u52d5\u518d\u751f\u30fb\u30eb\u30fc\u30d7\u518d\u751f\u30fb\u6d88\u97f3\u30fb\u30a4\u30f3\u30e9\u30a4\u30f3\u518d\u751f\u306b\u3059\u308b\u305f\u3081\u306b <code><strong>autoplay  loop muted playsinline<\/strong><\/code> \u3092\u8ffd\u52a0\u3059\u308b\u3068\u3044\u3044\u3002<\/p>\n<h3 id=\"webp\">WebP<\/h3>\n<p>WebP \u306f\u3001Chrome \u3060\u3051\u304c\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3067\u306f\u3082\u306f\u3084\u306a\u304f\u306a\u3063\u305f\u3002\u30b0\u30ed\u30fc\u30d0\u30eb\u3067 72 %\u306e\u30e6\u30fc\u30b6\u30fc\u304c\u5229\u7528\u3067\u304d\u308b\u3002<br \/>\n[\u9234\u6728\u88dc\u8db3: WebP \u306f Google \u304c\u958b\u767a\u3057\u305f\u3001\u54c1\u8cea\u3092\u4fdd\u3063\u305f\u307e\u307e\u9ad8\u5727\u7e2e\u3067\u304d\u308b\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3002]<\/p>\n<ul>\n<li>Chrome: \u30b5\u30dd\u30fc\u30c8<\/li>\n<li>MS Edge: \u30b5\u30dd\u30fc\u30c8<\/li>\n<li>Firefox: \u30b5\u30dd\u30fc\u30c8\u4e88\u5b9a [\u203b\u9234\u6728\u88dc\u8db3: <a href=\"https:\/\/www.fxsitecompat.com\/ja\/docs\/2018\/webp-image-support-has-been-added\/\">\u30d0\u30fc\u30b8\u30e7\u30f3 65 \u304b\u3089<\/a>\u304b\uff1f]<\/li>\n<li>Safari: \uff1f<\/li>\n<\/ul>\n<p>WebP \u306f JPEG \u3084 PNG \u306b\u6bd4\u3079\u308b\u3068\u300125\u301c35 % \u30b5\u30a4\u30ba\u304c\u5c0f\u3055\u304f\u306a\u308b\u3002The Tribune\uff08\u30a4\u30f3\u30c9\u306e\u30cb\u30e5\u30fc\u30b9\u30b5\u30a4\u30c8\uff09\u3067\u306f\u3001WebP \u306e\u30b5\u30dd\u30fc\u30c8\u5f8c\u3001\u30da\u30fc\u30b8\u306e\u8aad\u307f\u8fbc\u307f\u6642\u9593\u304c 30 %\u6539\u5584\u3057\u305f\u3002<\/p>\n<p>WebP \u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u30d6\u30e9\u30a6\u30b6\u3068\u3057\u306a\u3044\u30d6\u30e9\u30a6\u30b6\u306e\u4e21\u65b9\u306b\u9069\u5207\u306b\u753b\u50cf\u3092\u914d\u4fe1\u3059\u308b\u3088\u3046\u306b HTML \u30bf\u30b0\u3092\u8a18\u8ff0\u3067\u304d\u308b\u3002<\/p>\n<pre style=\"overflow-x: auto\"><code class=\"green\">&lt;picture&gt;\r\n    &lt;source type=\"image\/webp\" srcset=\"flowwer.webp\"&gt; &#x2b05; WebP\r\n    &lt;source type=\"image\/jpeg\" srcset=\"flowwer.jpg\"&gt; &#x2b05; JPG\r\n    &lt;img src=\"flower.jpg\"&gt;\r\n&lt;\/picture&gt;<\/code><\/pre>\n<p class=\"p30-t\">\u30d6\u30e9\u30a6\u30b6\u304c WebP \u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308c\u3070 WebP \u3092\u8aad\u307f\u8fbc\u3080\u3057\u3001\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u306a\u3051\u308c\u3070 JPG \u3092\u8aad\u307f\u8fbc\u3080\u3002\u4e0a\u304b\u3089\u9806\u756a\u306b\u3001\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u753b\u50cf\u3092 1 \u3064\u3060\u3051\u8aad\u307f\u8fbc\u3080\u3002img \u30bf\u30b0\u306f\u3001<code>picture<\/code>\/<code>srcset<\/code> \u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u306a\u3044\u53e4\u3044\u30d6\u30e9\u30a6\u30b6\u5411\u3051\u3002<\/p>\n<h3>\u52d5\u753b\u30d5\u30a9\u30fc\u30de\u30c3\u30c8<\/h3>\n<p>\u5c06\u6765\u7684\u306b\u306f\u3001\u65b0\u3057\u3044\u52d5\u753b\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e AV 1 \u3092\u63a8\u5968\u3059\u308b\u3002<\/p>\n<p><strong>AV1 \u306e\u5727\u7e2e:<\/strong><\/p>\n<ul>\n<li>VP 9 (WebM) \u3088\u308a\u3082 \u7d04 30 % \u512a\u308c\u3066\u3044\u308b<\/li>\n<li>x264 (MPEG-4) \u3088\u308a\u3082 45 \u301c50 %\u512a\u308c\u3066\u3044\u308b<\/li>\n<\/ul>\n<p>\u30c7\u30b9\u30af\u30c8\u30c3\u30d7\u7248 Chrome 70 \u3067 AV1 \u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u3002<\/p>\n<h3>\u753b\u50cf\u5727\u7e2e<\/h3>\n<p>\u753b\u50cf\u306e\u5727\u7e2e\u306b\u306f 2 \u7a2e\u985e\u3042\u308b\u3002<\/p>\n<ul>\n<li><strong>Lossless<\/strong>: \u30c7\u30fc\u30bf\u3092\u640d\u5931\u3057\u306a\u3044<\/li>\n<li><strong>Lossy<\/strong>: \u30c7\u30fc\u30bf\u3092\u5931\u3046\u304c\u3001\u3088\u308a\u9ad8\u3044\u5727\u7e2e\u304c\u53ef\u80fd<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" itemprop=\"image\" src=\"https:\/\/www.suzukikenichi.com\/images\/Speed_Essentials2.png\" alt=\"Lossless \u5727\u7e2e vs. Lossy \u5727\u7e2e\" width=\"755\" height=\"376\" \/><\/p>\n<p>\u5c11\u306a\u304f\u3068\u3082 Lossless \u3067\u5727\u7e2e\u3059\u308b\u3079\u304d\u3002\u307b\u3068\u3093\u3069\u306e\u30b5\u30a4\u30c8\u306b\u3068\u3063\u3066\u306f\u3001\u3088\u308a\u9ad8\u5727\u7e2e\u3059\u308b\u305f\u3081\u306b Lossy \u3092\u4f7f\u3046\u306e\u3082\u3044\u3044\u3002<\/p>\n<p>Lossy \u5727\u7e2e\u306f\u30010 \u301c 100 \u306e\u30b9\u30b1\u30fc\u30eb\u3067\u5727\u7e2e\u7387\u3092\u8a2d\u5b9a\u3067\u304d\u308b\u3002\u30bc\u30ed\u306b\u8fd1\u3065\u304f\u307b\u3069\u9ad8\u5727\u7e2e\u3002\u305f\u3060\u3057\u753b\u50cf\u306e\u30af\u30aa\u30ea\u30c6\u30a3\u3082\u843d\u3061\u308b\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" itemprop=\"image\" src=\"https:\/\/www.suzukikenichi.com\/images\/Speed_Essentials3.png\" alt=\"Lossy \u5727\u7e2e \u3068\u753b\u50cf\u54c1\u8cea\" width=\"919\" height=\"340\" \/><\/p>\n<p>\u307b\u3068\u3093\u3069\u306e\u753b\u50cf\u3067\u306f\u300180 \u301c 85 \u3067\u5727\u7e2e\u3059\u308c\u3070\u3001\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092 30 \u301c 40 % \u524a\u6e1b\u3057\u3064\u3064\u3001\u30af\u30aa\u30ea\u30c6\u30a3\u306e\u52a3\u5316\u306f\u6700\u4f4e\u9650\u306b\u6291\u3048\u3089\u308c\u308b\u3002<\/p>\n<p>\u5727\u7e2e\u30c4\u30fc\u30eb\u306f\u3001Imagemin \u304c\u30dd\u30d4\u30e5\u30e9\u30fc\u3002webpack \u3084 node.js\u3001gulp \u306a\u3069\u3055\u307e\u3056\u307e\u306a\u6280\u8853\u304b\u3089\u5229\u7528\u3067\u304d\u308b\u3002JPG \u3084 PNG\u3001GIF \u306a\u3069\u4e3b\u3060\u3063\u305f\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u30d7\u30e9\u30b0\u30a4\u30f3\u304c\u3042\u308b\u3002<\/p>\n<h3>\u753b\u50cf\u306e\u30b5\u30a4\u30ba<\/h3>\n<p>\u3059\u3079\u3066\u306e\u30c7\u30d0\u30a4\u30b9\u306b\u5bfe\u3057\u3066\u540c\u3058\u5927\u304d\u3055\u306e\u753b\u50cf\u3092\u914d\u4fe1\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u30c7\u30d0\u30a4\u30b9\u306e\u30b9\u30af\u30ea\u30fc\u30f3\u30b5\u30a4\u30ba\u306b\u5408\u308f\u305b\u305f\u5927\u304d\u3055\u306e\u753b\u50cf\u3092\u914d\u4fe1\u3059\u308b\u3002\u30c7\u30fc\u30bf\u306e\u8ee2\u9001\u91cf\u3092\u6291\u3048\u3089\u308c\u308b\u3060\u3051\u3067\u306f\u306a\u304f\u3001CPU \u306e\u4f7f\u7528\u3082\u6291\u3048\u3089\u308c\u308b\u3002<\/p>\n<p>\u307b\u3068\u3093\u3069\u306e\u30b5\u30a4\u30c8\u3067\u306f\u30013 \u301c 5 \u7a2e\u985e\u306e\u30b5\u30a4\u30ba\u306e\u753b\u50cf\u3092\u6e96\u5099\u3057\u3066\u304a\u304f\u3068\u3044\u3044\u3002Instagram \u306f\u5b9f\u969b\u306b\u305d\u3046\u3057\u3066\u3044\u308b\u3002\u8907\u6570\u30b5\u30a4\u30ba\u306e\u753b\u50cf\u3092\u914d\u4fe1\u3059\u308b\u3053\u3068\u3067\u3001Instagram \u306f \u5e73\u5747\u3057\u3066 20 %  \u307b\u3069\u30c7\u30fc\u30bf\u306e\u8ee2\u9001\u91cf\u3092\u524a\u6e1b\u3067\u304d\u305f\u3002<\/p>\n<p>\u753b\u50cf\u30b5\u30a4\u30ba\u5909\u66f4\u306e\u30c4\u30fc\u30eb\u3068\u3057\u3066\u3001npm\u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u6b21\u3092\u5229\u7528\u3067\u304d\u308b\u3002<\/p>\n<ul>\n<li>Sharp<\/li>\n<li>Jimp<\/li>\n<\/ul>\n<p><strong>\u8907\u6570\u306e\u30b5\u30a4\u30ba\u306e\u753b\u50cf\u3092\u914d\u4fe1\u3059\u308b\u3068\u304d\u306e HTML \u30bf\u30b0:<\/strong><br \/>\n<code class=\"green\">&lt;img scrset=\"flower-small.jpg 480w, flower-large.jpg 1080w\" sizes=\"50vw\" src=\"flower.jpg\"&gt;<\/code><\/p>\n<p><code>px<\/code> \u3067\u306f\u306a\u304f\u3001<code>w<\/code> \u3092\u4f7f\u3046\uff081\u884c\u76ee\uff09\u3002<br \/><code>srcset<\/code> \u3068 <code>sizes<\/code> \u306b\u3088\u3063\u3066\u753b\u50cf\u306e\u5927\u304d\u3055\u3092\u793a\u3059\u3053\u3068\u3067\u3001\u3069\u306e\u753b\u50cf\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u3079\u304d\u304b\u3092\u30d6\u30e9\u30a6\u30b6\u304c\u6c7a\u5b9a\u3067\u304d\u308b\u3002<\/p>\n<h3>Lazy Loading<\/h3>\n<p>Lazy Loading\/Lazyload \u306f\u5fc5\u8981\u306b\u306a\u308b\u307e\u3067\u30ea\u30bd\u30fc\u30b9\u306e\u8aad\u307f\u8fbc\u307f\u3092\u9045\u3089\u305b\u308b\u6280\u8853\u3002\u753b\u50cf\u306b\u3088\u304f\u4f7f\u308f\u308c\u308b\u304c\u3001\u307b\u304b\u306e\u30ea\u30bd\u30fc\u30b9\u3001\u305f\u3068\u3048\u3070 JavaScript \u306b\u3082\u5229\u7528\u3067\u304d\u308b\u3002Lazyload \u306f\u6700\u521d\u306e\u8aad\u307f\u8fbc\u307f\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u4e0a\u3052\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n<p>\u307e\u305f\u3059\u3050\u306b\u4f7f\u7528\u3057\u306a\u3044\u30ea\u30bd\u30fc\u30b9\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3057\u306a\u3044\u306e\u3067\u3001\u30c7\u30fc\u30bf\u8ee2\u9001\u91cf\u3092\u6291\u3048\u308b\u3053\u3068\u3082\u3067\u304d\u308b\u3002<\/p>\n<p>Spotify \u306f Lazyload \u3092\u6709\u52b9\u306b\u4f7f\u3063\u3066\u3044\u308b\u3002\u30da\u30fc\u30b8\u306e\u8868\u793a\u3068\u3068\u3082\u306b\u305d\u306e\u30da\u30fc\u30b8\u306b\u3042\u308b\u3059\u3079\u3066\u306e\u753b\u50cf\u3092\u8aad\u307f\u8fbc\u3093\u3060\u3068\u3059\u308b\u3068 18 MB \u306b\u306a\u308b\u3002Lazyload \u3092\u4f7f\u3063\u3066\u30b9\u30af\u30ea\u30fc\u30f3\u306b\u5165\u308b\u753b\u50cf\u3060\u3051\u3092\u8aad\u307f\u8fbc\u307e\u305b\u308b\u3068 1 MB\u306b\u6e1b\u308b\u3002<\/p>\n<p>Lazyload \u306f JavaScript \u3067\u5b9f\u88c5\u3059\u308b\u306e\u304c\u4e00\u822c\u7684\u3002\u3057\u304b\u3057\u3001Chrome \u304c\u30d6\u30e9\u30a6\u30b6\u306e\u6a5f\u80fd\u3068\u3057\u3066 Lazyload \u3092\u30cd\u30a4\u30c6\u30a3\u30d6\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u3088\u3046\u306b\u306a\u308b\u3002\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u88fd\u306e\u30b9\u30af\u30ea\u30d7\u30c8\u306f\u4e0d\u8981\u3002<\/p>\n<p class=\"p40-b\">[\u203b\u9234\u6728\u88dc\u8db3] Chrome \u306e Lazyload \u30cd\u30a4\u30c6\u30a3\u30d6\u30b5\u30dd\u30fc\u30c8\u306b\u95a2\u3057\u3066\u306f<a href=\"https:\/\/www.suzukikenichi.com\/blog\/chrome-may-support-lazy-load-natively\/\">\u3053\u3061\u3089\u306e\u8a18\u4e8b<\/a>\u3092\u53c2\u7167<\/p>\n<h2>\u30d5\u30a9\u30f3\u30c8<\/h2>\n<p>\u5916\u90e8\u304b\u3089\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u308b\u30a6\u30a7\u30d6\u30d5\u30a9\u30f3\u30c8\u3082\u30b9\u30d4\u30fc\u30c9\u3092\u9045\u304f\u3059\u308b\u8981\u56e0\u306b\u306a\u308b\u3002<\/p>\n<p>Flash of Invisible Text (FOIT) \u3068\u547c\u3076\u73fe\u8c61\u304c\u3042\u308b\u3002\u30d6\u30e9\u30a6\u30b6\u304c\u30a6\u30a7\u30d6\u30d5\u30a9\u30f3\u30c8\u3092\u8aad\u307f\u8fbc\u3080\u307e\u3067\u3001\u6587\u5b57\u304c\u73fe\u308c\u306a\u3044\u3002 <\/p>\n<p><video autoplay loop playsinline width=\"620\" height=\"352\" layout=\"responsive\"><source src=\"https:\/\/www.suzukikenichi.com\/images\/foit.mp4\" type=\"video\/mp4\"\/><\/video><\/p>\n<p>FOIT \u306f\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\u304c\u60aa\u3044\u306e\u3067\u3001Flash of Unstyled Text (FOUT) \u3092\u63a1\u7528\u3059\u308b\u3068\u3044\u3044\u3002FOUT \u3067\u306f\u3001\u30d6\u30e9\u30a6\u30b6\u304c\u30a6\u30a7\u30d6\u30d5\u30a9\u30f3\u30c8\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u308b\u307e\u3067\u3001\u30b7\u30b9\u30c6\u30e0\u30d5\u30a9\u30f3\u30c8\uff08PC \u3084\u30b9\u30de\u30db\u306b\u5165\u3063\u3066\u3044\u308b\u30d5\u30a9\u30f3\u30c8\uff09\u3092\u4ee3\u308f\u308a\u306b\u4f7f\u3063\u3066\u6587\u5b57\u3092\u8868\u793a\u3059\u308b\u3002\u6587\u5b57\u306f\u30d6\u30e9\u30a6\u30b6\u306b\u3059\u3050\u306b\u8868\u793a\u3055\u308c\u308b\u3002\u30a6\u30a7\u30d6\u30d5\u30a9\u30f3\u30c8\u306e\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u304c\u5b8c\u4e86\u3059\u308b\u3068\u3001\u30b7\u30b9\u30c6\u30e0\u30d5\u30a9\u30f3\u30c8\u3068\u7f6e\u304d\u63db\u308f\u308b\u3002<\/p>\n<p>FOUT \u306f\u7c21\u5358\u306b\u5b9f\u88c5\u3067\u304d\u308b\u3002<\/p>\n<pre style=\"overflow-x: auto\"><code class=\"green\">@font-face {\r\n\tfont-family: 'Pacifico';\r\n\tsrc: url (...pacifico.woff22) format ('woff2');\r\n\t<strong>font-display: swap;<\/strong>\r\n}<\/code><\/pre>\n<p class=\"p30-t p40-b\">\u6700\u5f8c\u306e\u884c\u304c\u30d5\u30a9\u30f3\u30c8\u3092\u5165\u308c\u66ff\u3048\u308b\u3088\u3046\u306b\u30d6\u30e9\u30a6\u30b6\u306b\u547d\u4ee4\u3059\u308b\u90e8\u5206\u3002<\/p>\n<h2>JavaScript<\/h2>\n<p>\u753b\u50cf\u3068\u30d5\u30a9\u30f3\u30c8\u3068\u4e26\u3093\u3067\u3001JavaScript \u3082\u30a6\u30a7\u30d6\u3067\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3055\u308c\u308b\u30c7\u30fc\u30bf\u91cf\u306e\u4e0a\u4f4d\u306b\u5165\u308b\u30ea\u30bd\u30fc\u30b9\u3002JavaScript \u306e 1\u30da\u30fc\u30b8\u3042\u305f\u308a\u306e\u30c7\u30fc\u30bf\u306e\u4e2d\u592e\u5024\u306f\u3001\u30e2\u30d0\u30a4\u30eb\u3067 370KB\u3001\u30c7\u30b9\u30af\u30c8\u30c3\u30d7\u3067 420KB\u3002JavaScript \u306f\u5727\u7e2e\u3055\u308c\u3066\u8ee2\u9001\u3055\u308c\u308b\u306e\u3067\u5b9f\u969b\u306b\u306f 1MB\u307b\u3069\u306e\u30b5\u30a4\u30ba\u306e\u30d5\u30a1\u30a4\u30eb\u3002\u305d\u308c\u3092\u5143\u306b\u623b\u3057\u3066\u3001\u30d1\u30fc\u30b9\u3057\u3066\u3001\u5b9f\u884c\u3059\u308b\u3068\u306a\u308b\u3068\u6027\u80fd\u306e\u4f4e\u3044\u30c7\u30d0\u30a4\u30b9\u3067\u306f\u975e\u5e38\u306b\u9045\u304f\u306a\u308b\u3002<\/p>\n<p>JavaScript \u304c\u4f7f\u308f\u308c\u308b\u5834\u304c\u307e\u3059\u307e\u3059\u5897\u3048\u3066\u304d\u3066\u3044\u308b\u306e\u3067\u3001JavaScript \u306e\u9ad8\u901f\u5316\u304c\u5fc5\u8981\u3002<\/p>\n<p>JavaScript \u306e\u6700\u9069\u5316\u306b\u306f\u6b21\u306e\u3088\u3046\u306a\u65bd\u7b56\u304c\u52b9\u679c\u7684\u3002<\/p>\n<ul>\n<li>Code Splitting<\/li>\n<li>Preload<\/li>\n<li>\u5229\u7528\u3057\u306a\u3044 CSS\/JS \u306e\u8abf\u67fb<\/li>\n<\/ul>\n<h3>UNIQLO \u4e8b\u4f8b<\/h3>\n<p>UNIQLO Canada \u306f JavaScript \u306e\u6700\u9069\u5316\u3067\u9ad8\u901f\u5316\u306b\u6210\u529f\u3057\u305f\u3002<\/p>\n<p><strong>UNIQLO \u304c\u3084\u3063\u305f\u3053\u3068:<\/strong><\/p>\n<ul>\n<li>Code Splitting<\/li>\n<li>Performance Budget<\/li>\n<li>etc.<\/li>\n<\/ul>\n<p><strong>\u6210\u679c:<\/strong><\/p>\n<ul>\n<li>Time to Interactive: 2 \u79d2 &#x2b07;<\/li>\n<li>\u76f4\u5e30\u7387: 14 % &#x2b07;<\/li>\n<li>\u6ede\u5728\u6642\u9593: 31% &#x2b06;<\/li>\n<li>\u30bb\u30c3\u30b7\u30e7\u30f3\u3042\u305f\u308a\u306e PV: 25 % &#x2b06;<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" itemprop=\"image\" src=\"https:\/\/www.suzukikenichi.com\/images\/uniqlo-case-study-cds2018-tti.png\" alt=\"UNIQLO \u6210\u529f\u4e8b\u4f8b\" width=\"837\" height=\"454\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" itemprop=\"image\" src=\"https:\/\/www.suzukikenichi.com\/images\/uniqlo-case-study-cds2018.png\" alt=\"UNIQLO \u6210\u529f\u4e8b\u4f8b\" width=\"837\" height=\"454\" \/><\/p>\n<p>\u6210\u679c\u306b\u95a2\u3057\u3066\u306f\u307b\u304b\u306e\u8981\u56e0\u3082\u95a2\u4fc2\u3057\u3066\u3044\u308b\u3060\u308d\u3046\u304c\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5411\u4e0a\u304c\u5927\u304d\u304f\u8ca2\u732e\u3057\u3066\u3044\u308b\u3053\u3068\u306f\u78ba\u304b\u3002<\/p>\n<p class=\"p60-t\">\u4ee5\u4e0a\u3067\u3059\u3002<\/p>\n<p>JavaScript \u306e\u6700\u9069\u5316\u306b\u95a2\u3057\u3066\u306f\u3001\u7aef\u6298\u3063\u3066\u3044\u307e\u3059\uff08\u50d5\u306f\u958b\u767a\u8005\u3067\u306f\u306a\u3044\u306e\u3067\u3001\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u306e\u90e8\u5206\u3092\u9069\u5207\u306b\u89e3\u8aac\u3067\u304d\u306a\u3044\u6c17\u304c\u3059\u308b\u305f\u3081&#x1f625;\uff09\u3002<br \/>\u30bb\u30c3\u30b7\u30e7\u30f3\u306e\u9332\u753b\u304c YouTube \u306b\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u8a73\u3057\u304f\u77e5\u308a\u305f\u3044\u65b9\u306f\u8996\u8074\u3057\u3066\u304f\u3060\u3055\u3044\uff08<a href=\"https:\/\/youtu.be\/reztLS3vomE?t=747\">12:27<\/a> \u3042\u305f\u308a\u304b\u3089 JavaScript \u306e\u30d1\u30fc\u30c8\u304c\u59cb\u307e\u308a\u307e\u3059\uff09\u3002<\/p>\n<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/reztLS3vomE\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<p>\u4e00\u65b9\u3001\u753b\u50cf\u306e\u6700\u9069\u5316\u306f\u6280\u8853\u306b\u3055\u307b\u3069\u8a73\u3057\u304f\u306a\u304f\u3066\u3082\u5b9f\u884c\u3067\u304d\u308b\u3053\u3068\u304c\u591a\u304b\u3063\u305f\u306f\u305a\u3067\u3059\u3002<br \/>\u753b\u50cf\u306f\u6539\u5584\u306e\u4f59\u5730\u304c\u6700\u3082\u591a\u304f\u3001\u96e3\u6613\u5ea6\u304c\u6bd4\u8f03\u7684\u4f4e\u3044\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u52b9\u679c\u304c\u5927\u304d\u3044\u306e\u304c\u7279\u5fb4\u3067\u3059\u3002<br \/>\u3067\u304d\u308b\u3053\u3068\u304b\u3089\u3055\u3063\u305d\u304f\u8a66\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Chrome Dev Summit 2018 \u306e\u30bb\u30c3\u30b7\u30e7\u30f3\u30ec\u30dd\u30fc\u30c8\u3002\u30bb\u30c3\u30b7\u30e7\u30f3\u306e\u30bf\u30a4\u30c8\u30eb\u306f \u201cSpeed Essentials: Key Techniques for Fast Websites\u201d\u3002\u30e2\u30d0\u30a4\u30eb\u30a6\u30a7\u30d6\u306e\u9ad8\u901f\u5316\u304c\u30c6\u30fc\u30de\u3002\u5b9f\u8df5\u7684\u306a\u5185\u5bb9\u3067\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6539\u5584\u306b\u975e\u5e38\u306b\u5f79\u7acb\u3064\u30c6\u30af\u30cb\u30c3\u30af\u304c\u6e80\u8f09\u3060\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,1179,7,930],"tags":[654,1364,1446],"class_list":["post-9739","post","type-post","status-publish","format-standard","category-google-seo","category-mobile-seo","category-tools","category-conferences","tag-load-times","tag-chrome-dev-summit","tag-chrome-dev-summit-2018"],"_links":{"self":[{"href":"https:\/\/www.suzukikenichi.com\/blog\/wp-json\/wp\/v2\/posts\/9739","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.suzukikenichi.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.suzukikenichi.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.suzukikenichi.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.suzukikenichi.com\/blog\/wp-json\/wp\/v2\/comments?post=9739"}],"version-history":[{"count":0,"href":"https:\/\/www.suzukikenichi.com\/blog\/wp-json\/wp\/v2\/posts\/9739\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.suzukikenichi.com\/blog\/wp-json\/wp\/v2\/media?parent=9739"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.suzukikenichi.com\/blog\/wp-json\/wp\/v2\/categories?post=9739"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.suzukikenichi.com\/blog\/wp-json\/wp\/v2\/tags?post=9739"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}