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A while ago I blogged about Firebug, a great Firefox extension for analyzing web pages (including CSS and JavaScript) and the interactivity between a browser and web servers.
Yahoo! have built on Firebug to produce a tool that goes even further. They call it: YSlow for Firebug.
Based on “Thirteen Simple Rules for Speeding Up Your Web Site” YSlow analyzes a web page, produces some reports (with a score card) and gives advice on improvements. This can be a great help in improving your website’s performance and reduce it’s bandwidth usage.
Also see this blog entry: