JavaScript to test each CSS class on a page and report which are hindering performance
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TestPage.html
readme.markdown
stressTest.js

readme.markdown

CSS Stress Test

This project is a bookmarklet for stress testing the CSS on any given webpage.
It indexes all the elements and their classes, and then--class by class--it removes one, and times how long it takes to scroll the page. Classes that save a considerable amount of time when removed indicate problem areas.

To install the bookmarklet, visit my blog post on this project: http://andy.edinborough.org/CSS-Stress-Testing-and-Performance-Profiling