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Pingdom web site monitoring and other infrastructure for you and instantly let you know when...
Created by Pingdom
GTmetrix is a free tool that analyzes your page's speed performance.
Comprehensive website and web application monitoring:
Created by ZOHO Corp.
Run a free website speed test from multiple locations around the globe using real browsers...
Created by WPO Foundation
Be notified if your Google PageSpeed falls.
Created by Thomas Bolander and Daniel Maul