zenback の読み込みコードが非同期化され、かつ 平均20%+の速度アップが図られた そうで、ユーザーとしては嬉しい限りです。 zenback に限らずソーシャルメディアの導入は、必然的に外部サービスを多用することになります。どのサービスも、スクリプトや画像、トラッキング用コードなどのリソースを、その特性に合わせて 2〜4 程度のホスト／ドメインに分散させているのが普通です。 こういった分散化は並列に読み込みめるリソース数を増やし、クッキーのあり／なしを区別できるので高速化に寄与します。が、利用するサービス数が多くなると、いわゆる「DNS ルックアップ」にかかる時間が無視できなくなり、さすがにデメリットの方が目立ってきます。 例えば本サイトの場合、最終的に25以上の異なるホスト／ドメインから 有象無象 のリソースを読み込んでいるのですが、「DNS ルックアップ」の合計だけで1秒を超える
Teleconferences: Weekly Face-to-face: we will meet during the W3C's annual Technical Plenary week (if space available); an additional face-to-face meeting may be scheduled by consent of the participants IRC channel: #webperf Scope As Web browsers and their underlying engines include richer capabilities and become more powerful, web developers are building more sophisticated applications where appl
Take Care When Using Null Transform Hacks For Forcing GPU Acceleration March 10, 2013 At my jQueryTO keynote on paint optimization, I mentioned the performance benefits of promoting DOM elements to a composite layer using GPU acceleration in Chrome. Moving compositing of page layers to the GPU can offer better efficiency than the CPU in terms of speed and drawing and is generally a good thing as y
Information related to commonly used benchmarks and compliance measures for the web Bold means commonly used in media Compliance HTML5Test Targeted for "HTML5 Ready" apps/usage Tests existence of certain APIs but not really compliance; easy to game and being gamed. We disagree that the FileSystem API should be part of this suite, no vendor other than Google implements and they seem to have given u
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October 9, 2012 5:06 pm | 25 Comments I just returned from Velocity Europe in London. It was stellar. And totally exhausting! But this post is about the other fantastic web performance event that took place after Velocity: WebPerfDays London. WebPerfDays is like a day-long web performance meetup event. Aaron Kulick organized the first one last June right after Velocity US. He had the brilliant ide
JetStream 2.2 is a JavaScript and WebAssembly benchmark suite focused on the most advanced web applications. It rewards browsers that start up quickly, execute code quickly, and run smoothly. For more information, read the in-depth analysis. Bigger scores are better.
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Date.now() // 1337376068250 performance.now() // 20303.427000007 You'll notice the two above values are many orders of magnitude different. performance.now() is a measurement of floating point milliseconds since that particular page started to load (the performance.timing.[navigationStart](https://www.w3.org/TR/navigation-timing/#dom-performancetiming-navigationstart) timeStamp to be specific). Yo
We are pleased to announce that we are starting work on a third book in this series, which will be titled The Performance of Open Source Applications. Each chapter will discuss a performance issue in a real open source system—it could be an over-the-shoulder view of how a performance problem was fixed, a discussion of how design decisions affected performance in a particular application, or someth
The JIT inspector instruments generated JavaScript JIT code to record information about how much code has run and how well it was optimized: - How many times individual operations have been executed. - Whether operations executed entirely in JIT code (fast) or as calls into the underlying virtual machine (slow). - Precision of type information inferred for each operation, as used for optimization.
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