FIREBUG – Extension – LOVE IT.

Speed god DAMN IT.

SPEED.

METH.

ADDICTION.

clipped from developer.yahoo.com

Speed up your web pages with YSlow

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:


Download Now

Install Firebug first!


  • Performance report card
  • HTTP/HTML summary
  • List of components in the page
  • Tools including JSLint


Visit Yahoo! Exceptional Performance on YDN.

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.

Performance View

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.

Stats View

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.

Components View
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