GTmetrix: Free website speed test tool
GTmetrix: Analyze your site’s speed and make it faster.
GTmetrix is a free tool that analyzes your page's speed performance
Get a summary of key performance indicators:
Analyze your page with Google PageSpeed and Yahoo! YSlow rulesets
Get your page's Page Load Time, Total Page Size and Total # of Requests
See your page's performance relative to the average of all sites analyzed on GTmetrix
More tests, more monitoring, more features.