The Critical Request: How to Prioritise Requests to Improve Speed Serving a website seems pretty straightforward: send down some HTML, the browser figures out what resources to load next. Then, we wait patiently for the page to be ready. Little did you know, a lot is going on under the hood. Have you ever wondered how the browser figures out which assets should be requested and in what order? Toda
Today we’ll dive into insights from Chrome’s networking stack to provide clarity on how web loading primitives (like <link rel=“preload”> & <link rel=“prefetch”>) work behind the scenes so you can be more effective with them. As covered well in other articles, preload is a declarative fetch, allowing you to force the browser to make a request for a resource without blocking the document’s onload e
Some of us in the Chrome Data Saver (Flywheel) team at Google (Simon Pelchat, Michael Buettner and Tom Bergan) experimented with the new preload directives as a means to improve page load performance for Chrome Data Saver users. We found our initial assumptions about preload to be wrong and decided to share our experiences in the hope they might benefit others. This post summarizes our findings. F
Safari Technology Preview Release 24 is now available for download for macOS Sierra. If you already have Safari Technology Preview installed, you can update from the Mac App Store’s Updates tab. This release covers WebKit revisions 211256-212356. User Timing Added User Timing as an experimental feature (r211332) Implemented PerformanceObserver for User Timing (r211406) Added support for Performanc
layout: true class: center, middle background-image: url(media/mechanism.jpg) --- # On Preloads and Preloaders .center[Yoav Weiss | @yoavweiss] .right[] ??? Hi, I'm Yoav Weiss. I work for Akamai on making our CDN as well as browsers faster, and I'm here today to to answer 2 fundemental questions: --- # How do browsers load resources? ??? Something we rarely think a
The pre-loader (also known as the speculative or look-ahead pre-parser) may be the single biggest improvement ever made to browser performance. During their implementation Mozilla reported a 19% improvement in load times, and in a test against the Alexa top 2,000 sites Google found around a 20% improvement. It’s not a new browser feature but some seem to believe it’s Chrome only and yet others sug
Intro Preload を指定する <link rel=preload> の仕様が公開されており、現在 Chrome Canary に実装されている。 この仕様のモチベーションについて、 Chrome 開発者の Yoav Weiss 氏のブログも公開された。 今回は、この仕様の特徴と用途を解説し、本サイトへの適用について検討する。 W3C Preload Spec Intent to Ship: <link rel=preload> Preload: What Is It Good For? Preload Preload はリソースのローディングを最適化することを目的に策定された仕様である。 link 属性ファミリーで、最適化に用いられる値としては、以前書いた Resource Hints 系 と近いが、仕様としては別になっている。 また、既に HTTP2 においてこの仕様の一部が使
What is that preload? What does it do? And how can it help you? Preload gives developers the ability to define custom loading logic without suffering the performance penalty that script-based resource loaders incur. In human terms, it’s a way to tell a browser to start fetching a certain resource, because you as authors know that the browser is going to need that particular resource pretty soon. P
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