YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages.
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Sitespeed.io is an open source tool that helps you analyze and optimize your website speed and performance, based on performance best practices rules and collecting browser metrics using the Navigation Timing API and User Timings.
The OpenWayback Development
Make optimisation of images part of your automated build process
YSlow extension to measure how good or bad a page is according to Google Web Metrics