Toolbox
- Google Pagespeed - https://developers.google.com/speed/pagespeed/?hl=en
- Yahoo! YSlow - http://developer.yahoo.com/yslow/
- Google Chrome Dev Tools - https://developers.google.com/chrome-developer-tools/
- Firebug for Firefox - http://getfirebug.com/
- WebPagetest - http://www.webpagetest.org/
- Slowy App - http://slowyapp.com/