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Why is my web page slow? YSlow for Firebug can tell you.

Posted by Shane O'Sullivan on July 25, 2007

Yahoo have released a very useful extension for Firebug, which is itself an extension for Firefox, which can be used to analyze a web page’s performance. The extension, called YSlow, appears as a separate pane in Firebug, and gives you a whole load of statistics about your page.

However, in addition to the bare numbers, it also gives your page a ranking, from zero to a hundred, and offers tips in plain English on you can improve the performance of your page.

All in all, a very handy little addition to a web developer’s toolkit.

One caveat is that it is of course not perfect – I tried to use it on Gmail, and it gave the site a 98% mark (practically impossible to achieve in reality), as the initial page of the Gmail application simply loads a single JavaScript page and not much else. Therefore, YSlow seems to only analyze content sent down the wire to browser upon page load, and ignores generated content. However, this does not take away from the fact that it is perfectly suitable for the vast majority of websites out there.

More information available here, or read Ajaxian’s post here.
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Posted in Ajax, Firebug, Firefox, Javascript, Technical, tools | 1 Comment »

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