Maximally optimizing image loading for the web
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
JavaScript Loading Priorities in Chrome
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.
ProgressBar.js - Progress bars with JavaScript
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
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 | ゆっくりと…
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
ProgressBar.js - Progress bars with JavaScript
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
<script async>でJavaScriptの非同期読み込みを - fragmentary
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
Pegasus
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+
Faster YouTube Embeds with JavaScript — SitePoint
Stay Relevant and Grow Your Career in TechPremium ResultsPublish articles on SitePointDaily curated jobsLearning PathsDiscounts to dev toolsStart Free Trial7 Day Free Trial. Cancel Anytime. 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
Performance Auditing: A Firefox Developer Tools Deep Dive — SitePoint
Stay Relevant and Grow Your Career in TechPremium ResultsPublish articles on SitePointDaily curated jobsLearning PathsDiscounts to dev toolsStart Free Trial7 Day Free Trial. Cancel Anytime. In this article, we’ll cover Firefox Web Developer Tools (“DevTools”) — a set of tools designed to help developers inspect, debug, profile and optimize the performance of websites and web applications. We’ll pa
Deep dive into the murky waters of script loading | Articles | web.dev
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-driven quirk-hole. Knowing these quirks lets you pick the fastest, least disruptive way to load scripts. If you’re on a tight schedule,
サイト速度とonload再考 | ゆっくりと…
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 | Filament Group, Inc., Boston, MA
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
Authoring Critical Above-the-Fold CSS | CSS-Tricks
Get affordable and hassle-free WordPress hosting plans with Cloudways — start your free trial today. 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, and one that is getting very
spin.js
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
PACE — Automatic page load progress bars
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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GitHub - zeman/perfmap: Front-end performance heatmap bookmarklet.
Unpacking the Black Box: Benchmarking JS Parsing and Execution on Mobile Devices
window.onload vs document.onload
Optimised async loading of cross-domain scripts
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