PUBLIC MARKS with tags web & performance

When the web developer's life will begin to be at a memory level, we'll start seeing disappear crappy web apps. And crappy webdevs.

Slides de la conférence Performance Web au forum PHP Afup 2008, par Éric Daspet.

The Jiffy Firefox Extension adds an additional panel to Firebug that provides a visual view of the Javascript time measurements captured by Jiffy-Web.

Le concept de ces outils est le même : on prend une URL, on lance la page, et on trace la cascade des requêtes HTTP avec quelques statistiques. C’est là qu’on voit le temps pris par chaque composant, par la somme des composants, et les éventuels problèmes de performance comme les scripts bloquants.

Pagetest is an open source tool for measuring and analyzing web page performance right from your web browser. AOL developed Pagetest internally to automate load time measurement of its many websites, and it has evolved into a powerful tool for web developers and software engineers in testing their web pages and getting instant feedback. We decided to release it to the grander web development community to further help evolve it into an even more useful - and free - web performance tool.

PageTest allows you to provide the URL of a webpage to be tested. The test will be conducted from the location specified and you will be provided a waterfall of your page load performance as well as a comparison against an optimization checklist.

Steve Souders は Yahoo!の「Chief Performance Yahoo!」です。 ※こういう役職があるらしいですね これは彼の「パフォーマンス改善のベストプラクティス」を書いた一連のブログです。 O’Reillyから出版される予定の「High Performance Web Sites」の第一章の基になっています。 ※この内容はO’Reilly Media — Bookstore: High Performance Web Sites: Rough Cuts Versionとしてまとめられていて、正式版も今年の9月に出版されるとのこと。 邦訳も出版されました！

If you’re into adding a little JavaScript interactivity to your web pages you may have heard of JavaScript event delegation and thought it was one of those convoluted design patterns only hardcore JavaScript programmers worry about. The truth is, if you already know how to add JavaScript event handlers, it’s a snap to implement.

Les bons développeurs javascript utilisent les événements, à toutes les sauces. En fait quasiment tout ce qui est fait en javascript est en réaction à un événement. On arrive à deux problématiques qui ont un un impact plus ou moins important sur les performances :

Improving performance starts with metrics. How long does it take for the page to load? Seems like a simple question to answer, but gathering accurate measurements can be a challenge. In my experience, performance metrics exist at four stages along the development process.