um.. Are you using the right version of IE 9? The current version is IE 9 PP7 (1.9.8023.6000), which produced a Sunspider result of 216ms. You are testing the beta version of IE 9, which was released in back in September. Of course the old version of IE 9 will have a much slower speed. By the way the Sunspider result for IE 9 beta was about 340 ms