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.

DareBoost - DareBoost is an online tool to test, analyze and monitor your website: speed, SEO, quality, security. All you need for website optimization in a single service.

WebsiteSpeedAnalysis.com - Website Speed Analysis Tool

PageSpeed Insights - PageSpeed is addon for ...

SitePerformanceTest.com - Website Performance and Usability Test

WDT - Web Developer Tools - WDT - Web Developer Tools is a suite of useful tools for web developers Task Manager