Performance-Bookmarklet helps to analyze the current page through the Resource Timing API, Navigation Timing API and User-Timing - requests by type, domain, load times, marks and more. Sort of a light live WebPageTest.

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DOM Monster

A cross-platform, cross-browser bookmarklet that will analyze the DOM & other features of the page you're on, and give you its bill of health

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Yahoo YSlow for Mobile/Bookmarklet

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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