You're right, in my personal testing it does appear to be about 2x faster. The big perf wins: * Fewer box shadows * Fewer gradients * Fewer semitransparent

You're right, in my personal testing it does appear to be about 2x faster. The big perf wins: * Fewer box shadows * Fewer gradients * Fewer semitransparent borders (a big performance problem, especially in chrome - I've seen > 10x performance slowdowns when using rgba borders & border-radius: 0 - see Chrome's tracker [1]) * Simpler rules (fewer styles to cascade) 1. https://code.google.com/p/chromium/issues/detail?id=170882 https://code.google.com/p/chromium/issues/detail?id=170882