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YSlow? aka Y(!Fast)

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YSlow analyzes web pages and tells you why they're slow based on the rules for high performance web sites. YSlow is a Firefox add-on integrated with the popular Firebug web development tool.

YSlow gives you:
* Performance report card
* HTTP/HTML summary
* List of components in the page
* Tools including JSLint

Podcast, Screencast
Take a look at the YSlow Podcast and Screencast.

Performance View
YSlow analyzes any web page and generates a grade for each rule and an overall grade. If a page can be improved, YSlow lists the specific changes to be made.

Stats View
YSlow calculates the total size of the web page for both empty cache and primed cache scenarios, as well as information about cookies.

Components View
YSlow lists all the components in the page including their type, URL, Expires date, gzip status, load time, size, and ETag. You can also view the HTTP response headers for any component.

Click here to visit the YSlow page at the Yahoo Developer Network