CSS Stress Testing and Performance Profiling
I present you with the CSS Stress Test bookmarklet.
Now let me explain: I have been losing my sanity over the oddest issue. The project I’m working on right now has a fairly complex stylesheet. Performance for the site is absolutely critical. I’ve done my best to squeeze and optimize every line I can. In all browsers, it runs like a champion. Except IE9. It runs terribly in IE9. To make matters worse, it runs fine in IE8, IE7, and though it’s mangled, it even runs in IE6!