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).
They had years to do 2D acceleration in Linux way. What they did is maybe: copy, paste, modify...
The main reason of slow 2D performance is their crappy driver.