GTmetrix - GTmetrix is a free tool that analyzes your page's speed performance. Using PageSpeed and YSlow, GTmetrix generates scores for your pages and offers actionable recommendations on how to fix them.
Website Grader - Grade your website's strengths and weaknesses in seconds.
PageSpeed Insights - PageSpeed is addon for ...
PageSpeed Ninja - One-click page speed boost for WordPress
WebPagetest - Run a free website speed test from multiple locations around the globe using real browsers...
WebSite Auditor - The techie's SEO spider: find site issues other tools miss