Comment by no_more_death

Step 1: Learn to use the CSS profiler in Chrome.

Also, here are some articles I found in my links list:

CSS Stress Tester Bookmarklet (Copy into a bookmarklet. Then it will tell you the rules that are causing the most lag.)

javascript:(function(d){var s=d.createElement('script');s.src='http://andy.edinborough.org/Demos/css-stress/stressTest.js?_... es=d.getElementsByTagName('script')[0];es.parentNode.insertBefore(s,es);var doit=function(){if(window.stressTest){stressTest.bookmarklet();}else{setTimeout(doit,100);}};doit();})(document);

Old but still relevant I think: http://www.stevesouders.com/blog/2009/06/18/simplifying-css-... Text makes CSS slow (don't render too much): https://news.ycombinator.com/item?id=2232212 In general, following good guidelines might help: https://github.com/csswizardry/CSS-Guidelines