I know of YSlow with Firefox and http://webwait.com/ .

Any other services around?

closed as not constructive by ChrisF Feb 20 '12 at 12:59

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Google's Page Speed


AOL's WebPageTest





In addition to YSlow and WebPageTest mentioned in other answers I use the LORI (life of request information) extension for Firefox during development to give a quick indication of page speed.


It adds a few fields to the status bar to give you a quick overview of some important figures: time to first byte, time to completion, total size, number of requests

LORI status bar http://cl.ly/1XHi/content


Google-Chrome and Opera have builtin tools to analyze websites, including loadtime.

  1. Pingdom Tools Full Page Test: http://tools.pingdom.com/fpt
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    Would have posted more, but don't have enough juju on my account. – danielmiessler Jul 9 '10 at 5:05

Here is another nice one I found.

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