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Manning has published "Web Performance in Action" by Jeremy Wagner

Web Performance in Action is your companion guide to making websites faster. You'll learn techniques that speed the delivery of your site's assets to the user, increase rendering speed, decrease the overall footprint of your site, as well as how to build a workflow that automates common optimization techniques.

The full list of contents is available from Manning and WebPagetest users get 40% off with the discount code webpagetest40%.