Analyse performance of web pages with YSlow

YSlow is a plugin for Firefox developed by Yahoo that analyses your web pages and reports back on any performance issues (plus gives a grade). There is a performance report (which shows you areas which can be improved), stats (overview of what is loaded, cached/uncached, cookies and number of HTTP requests), components (page, CSS/JS,JPG etc - expiry, if gzip used, response time, ETag and file sizes) and various tools (view all CSS/JavaScript and a JSLint report).

This plugin depends on Firebug.

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