Speed test Online tools

Website Speed Test & Performance Optimization Tools

http://www.websiteoptimization.com/services/analyze/

http://gtmetrix.com/

http://tools.pingdom.com/

http://www.woorank.com/

http://www.webpagetest.org/

Firefox addons

YSlow
https://addons.mozilla.org/en-US/firefox/addon/5369

Google Page Speed
http://code.google.com/speed/page-speed/download.html