Originally Posted by kRogue
On another note, that KDE4 is slow, but other desktop environments perform well, is that not a clue that maybe it is Qt and KDE, not the drivers?
That logic works the other way, too. If KDE4 is slow with nvidia, but not the open source intel and radeon drivers, is that not a clue that it maybe is the drivers and not Qt and KDE?
Most likely it is a combination of both the drivers and the DE. The toolkit is probably assuming nvidia is accelerating that it's not accelerating.