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I know of Yslow with firefox and http://webwait.com/

Any other services around ?

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How is this not constructive? Not to mention that Jeff answered it himself. –  Dan Dascalescu Feb 25 at 11:32
    
It's an app recommendation request. Please see our help center. –  Al E. Feb 25 at 12:51
    
Technically it's also a duplicate - webapps.stackexchange.com/questions/6496/… –  ChrisF Feb 25 at 12:56
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closed as not constructive by ChrisF Feb 20 '12 at 12:59

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5 Answers

up vote 10 down vote accepted

Google's Page Speed

https://developers.google.com/speed/pagespeed/

AOL's WebPageTest

http://www.webpagetest.org/

GTMetrix

http://gtmetrix.com/

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+1 for webpagetest.org. It's a very nice service. –  splattne Jul 1 '10 at 7:05
    
yes, webpagetest.org is pretty neat, indeed. –  akira Jul 1 '10 at 7:24
    
some tips for speeding up static file download in an asp.net website stackoverflow.com/questions/3555304/… –  Oscar Aug 25 '10 at 7:06
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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.

https://addons.mozilla.org/en-US/firefox/addon/1743/

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

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

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  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
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