Betanews estimates that the IE9 chassis on Windows 7 offers 9.32 times better raw computational performance than IE8 on Windows 7, on the same machine. That's a welcome number due in large part to vastly improved scores in the widely respected SunSpider battery, as well as high scores in a new set of variable-workload computational tests produced by Betanews. Specifically on the SunSpider, the IE9 preview scored a 44.77 on Betanews' relative performance index, compared to 5.59 for IE8. Our index is based on cumulative relative performance in each category of the test battery, compared against the score posted by an old, slow Web browser: IE7 on Vista SP2. This means, yes, IE9 (thus far) offers almost 45 times the computational speed of IE7 on the older operating system -- easily the single largest surge we've seen between generations.
IE9 tech preview performs 7.8 times better than IE8