Lifehacker recently conducted a set of tests aimed to measure the speed of IE 9, Firefox 4 Beta, Chrome’s Crankshaft (also known as version 10), and Opera 11 Beta. And overall, it looks like the new version of Chrome is a winner!
Firefox 3.6(!) actually beat Chrome 10 in two areas: memory usage with extensions and without extensions. Chrome 8 beat out Chrome 10 in tab loading, and Opera 11 Beta took the lead in DOM/CSS processing (over Opera 10 and Chrome 10).
See the full article at Lifehacker.com for a detailed analysis.