Probably hardware acceleration http://blogs.msdn.com/b/ie/archive/2010/04/07/a-closer-look-at-internet-explorer-9-hardware-acceleration-through-flying-images.a

Probably hardware acceleration http://blogs.msdn.com/b/ie/archive/2010/04/07/a-closer-look-at-internet-explorer-9-hardware-acceleration-through-flying-images.aspx http://blogs.msdn.com/b/ie/archive/2010/04/07/a-closer-look-...