http://a.deveria.com/caniuse/
Scroll to the bottom, you'll see IE9 is behind even FireFox3 ... that's just sad... Chrome wins followed by FireFox and then Opera.
Then checkout (for JS parsing times)
http://news.cnet.com/8301-1001_3-10030888-92.html
That's a little bit older but... it smokes the competition even today.