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.
PageSpeed Insights - PageSpeed is addon for ...
CheckPageSpeed.com - Website Speed and Performance Analyzer
SitePerformanceTest.com - Website Performance and Usability Test
WebPagetest - Run a free website speed test from multiple locations around the globe using real browsers...
Google Lighthouse - Lighthouse is an open-source, automated tool for improving the quality of web pages.