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A slideshow explaining a number of jQuery performance tips, tricks, and coding standards.

FIrefox's javascript performance will apparently be significantly improved by introducing type inference to the JS compiler.

helps you profile your website's performance.

Performance Test Cases

Some tips for improving the performance of jQuery

A good tutorial on where you should define a function in javascript and why. Includes some major performances considerations. Basic takeaway: nested functions means tonnes of "identical" functions being creating.

Visibility.js allow you to determine whether your web page is visible to an user, is hidden in background tab or is prerendering. It allows you use the page visibility state in JavaScript logic and improve browser performance by disabling unnecessary timers and AJAX requests, or improve user interface experience (for example, by stopping video playback or slideshow when user switches to another browser tab).

Tools to measure and improve site performance. Includes measuring and improving images, css, javascript, caching, etc.

Tips for scaling Wordpress sites

"The CSS Editor for Visual Studio 11 Developer Preview is a complete rewrite of the 2010 version, featuring excellent performance and stability. As soon as you start to edit a CSS file or a style block embedded in a web page, you'll feel the difference!"