CSS Stress is a Testing and Performance Profiling
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Front-end performance heatmap 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.
YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high-performance web pages