GitHub - zeman/perfmap: Front-end performance heatmap bookmarklet.

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GitHub - madrobby/dom-monster

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CSS Stress Testing and Performance Profiling / Andy Edinborough

GitHub - micmro/performance-bookmarklet: 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.

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 li