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YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages. YSlow is a Firefox add-on integrated with the Firebug web development tool. YSlow grades web page based on one of three predefined ruleset or a user-defined ruleset. It offers suggestions for improving the page's performance, summarizes the page's components, displays statistics about the page, and provides tools for performance analysis, including Smush.it™ and JSLint.

FEATURES:

· Added the ability to detect post onload components, including for pages that prevent itself from being embedded and/or iframed. (experimental)
· Support for 3 main rulesets: default YSlow V2, Classic V1 and Small Site or Blog and the ability to create new ones based on these 3.
· Offenders in CDN rule are now listed as domains only.
· Runs multiple YSlow instances (new windows). This feature is excellent for comparing YSlow results for different pages side-by-side.