Techniques Behind Modern Web
They are extensions of Firebug which is, as you may know, a (well-known) plugin for Firefox. In other words, they are plugins of a plugin for Firefox.
Based on best practices for high performance web sites (a research conducted by the Exceptional Performance team of Yahoo), YSlow analyzes web pages and tells you why they’re slow.
The plugin adds a new tab to Firebug console and do analyses on the page on opening. Though being criticized for some impractical rules like using content delivery network (CDN), it’s very useful tool for those who want to have general view of web app performance from client side. Following rules where you can (but don’t care much about grades it gives) you will see your web apps running faster while eating less bandwidth.
Image: YSlow in action
The team has released a new version of YSlow that works with Firefox 3. The new version includes:
This version supports all possible combinations of the different Firefox and Firebug development branches, namely the latest Firefox 2 and 3 and the latest Firebug releases: 1.05 (stable), 1.1 (beta) and 1.2 (beta).
It’s also compatible with Firefox 3 and the latest Firebug beta (Firebug 1.2.0b3).
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