JavaScript Performance
But some of the strongest focus of the IE9 platform preview is targeted towards raising the so-called "glass ceiling" on web browsing performance. Microsoft hopes to drive that performance cap higher half through GPU-acceleration for rendering 2D, 3D, and HTMLMicrosoft provided a number of slides comparing JavaScript performance of IE 9 in its current preview, and claims it's at party with Firefox 3.6 and nearly as good as Chrome 4.0.249.89 (stable) tested with SunSpider 0.9:
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