Originally Posted by Alejandro Nova
About 2D acceleration: Linux is using 2D acceleration in a way that Windows never used before. We must give NVIDIA folks some time. I've not seen in Windows a massive use of 2D overlays and transparent surfaces, and, when I've tried to force them with addons in Windows... Windows XP becomes as slow as KDE 4.1. Vista is other story (hint: wait for Glucose).
Vista is indeed another story and it works just fine.
Far as I can remember Aero acceleration has worked beautifully since day one of Vista's release. The Windows driver had plenty of other problems back then (not least of which was stability) but 2D performance with transparency and compositing has always been working well.