In this post I'll outline 8 image loading optimization techniques to minimize both the bandwidth used for loading images on the web and the CPU usage for image display. I'll present them in the form of an annotated HTML example to make it easy for folks to reproduce the results. Some of these techniques are more established, while others are somewhat novel. Ideally, your favorite mechanism for pub
February 18, 2019 How browsers schedule and execute scripts can impact the performance of web pages. While techniques like <script defer>, <link rel=preload> (and others) influence script loading, knowing how browsers interpret them can also be helpful. Thanks to Kouhei Ueno, we now have an up to date summary of script scheduling in Chrome.
With ProgressBar.js, it's easy to create responsive and stylish progress bars for the web. Animations perform well even on mobile devices. It provides a few built‑in shapes like Line, Circle and SemiCircle but you can also create custom shaped progress bars with any vector graphic editor. ProgressBar.js is lightweight, MIT licensed and supports all major browsers including IE9+. Usage A simple cod
本ブログでは、サイトの高速化に直結する「JavaScript 非同期読み込み」の話題を多数取り上げてきました。タイトルに釣られてこの記事を見てくれている方なら Google Analytics の非同期コードスニペット はご存知でしょうし、規模の大きいサイトやアプリ用に RequireJS などのフレームワークを使っている方もいるでしょう。 GA も RequireJS も、動的に生成したスクリプト要素を DOM に埋め込む「DOM 挿入法」が用いられています。さらに遡れば、Steve Souders が 2009年4月の記事 ノン・ブロッキングなスクリプト読み込み で、6つの手法に分類しています。 果たしてこれらの方法は、サイトの高速化にとってベストなのでしょうか？ 答えは2012年12月の海外記事にありました。そこで本エントリーでは、日本ではほとんど取り上げられていない Frame i
With ProgressBar.js, it's easy to create responsive and stylish progress bars for the web. Animations perform well even on mobile devices. It provides a few built‑in shapes like Line, Circle and SemiCircle but you can also create custom shaped progress bars with any vector graphic editor. ProgressBar.js is lightweight, MIT licensed and supports all major browsers including IE9+. Usage A simple cod
JavaScriptファイルをスクリプトから非同期で読み込むパターンは古い、という話を目にしたのはもう半年前のこと。 言ったのはIlya Grigorik。月末のGoogle Japanでのイベント、月初のHTTP2ConferenceにくるWebパフォーマンス界のすごいひとですよ。 Script-injected "async scripts" considered harmful - igvita.com 件のパターンは、スクリプトで動的に script を生成して、そこに読み込みたいJavaScriptファイルをぶっこんで読み込むというもの。 <script> var script = document.createElement('script'); script.src = "//somehost.com/awesome-widget.js"; document.getEleme
Which is more widely supported: window.onload or document.onload?
Pegasus is a simple JavaScript solution to improve your average time to display data. Use it for static sites or when you can't do server-side data bootstrapping / rendering. Works in all major browsers and IE9+
August 12, 2014Faster YouTube Embeds with JavaScript Key Takeaways Leverage JavaScript to transform standard YouTube embeds into ‘lite’ versions that initially load only thumbnail images, significantly reducing initial page load times. Customize embedded YouTube videos using HTML5 data attributes to control player settings like autoplay, branding, and display controls, enhancing user experience an
What is performance? Creating a high performance web site is a delicate dance. Many people think it’s just about how fast your JavaScript performs. The reality is that it’s far more than that. There are also multiple ways to measure performance. The first is load time. From the time that a user clicks a link or enters a URL into the address bar, how long does it take to load that page? Even this h
Deep dive into the murky waters of script loading Stay organized with collections Save and categorize content based on your preferences. Introduction In this article I’m going to teach you how to load some JavaScript in the browser and execute it. No, wait, come back! I know it sounds mundane and simple, but remember, this is happening in the browser where the theoretically simple becomes a legacy
単にウケ狙いなら「革新的！GAのページ平均読み込み時間を劇的に速くする方法」とか「もう3rdパーティーに邪魔させない、超高速スクリプト読み込み術」（笑）とかの煽りタイトルを付けるところですが、今回はもっと本質的なことを論じてみたいと思います。 「プログレッシブレンダリングでUXを向上させるJS非同期読み込みのベストプラクティス」では、スクリプトの読み込みと実行を window.onload 対象から切り離し、見た目のページ速度を速くする方法について書きました。この方法は既存のスクリプトを書き換える必要があるため、Stoyan Stefanov によって 実験的に実装された Facebook SDK か、自前のスクリプトにしか適用できませんでした。 しかし今回、Hatena や Twitter、Pocket、Disqus など、他の 3rd パーティ製スクリプトにも適用できる方法 − “進化
Load CSS or JS Files Simply & Asynchronously Posted by Scott Jehl 07/14/2014 Ever wonder about the simplest, fastest way to load a CSS file or a JavaScript file asynchronously? Well, we happen to think about these things a lot, and over the years we’ve been using and improving a couple of basic functions, which we call loadCSS and loadJS, that do just that. Here’s how they work, in brief. loadCSS
Get affordable and hassle-free WordPress hosting plans with Cloudways, now offering 40% off for 4 months, and 40 free migrations. The following is a guest post by Ben Edwards. I saw Ben tweet about a simple Sass @mixin that allowed you designate bits of CSS as being “critical” – the idea being to load that critical CSS first and defer the loading of the rest of the CSS until later. A clever idea,
Share it! If checked, the option values will be stored in the URL so that you can easily share your settings. Features No images No dependencies Highly configurable Resolution independent Uses CSS keyframe animations Works in all major browsers Includes TypeScript definitions Distributed as a native ECMAScript module MIT License Spin.js dynamically creates spinning activity indicators that can be
What is Pace? Include pace.js and a CSS theme of your choice, and you get a beautiful progress indicator for your page load and ajax navigation. No need to hook into any of your code, progress is detected automatically. Download If you’re a developer, download Pace directly here: Pace.js Themes Enter a color:
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