Originally Posted by progger1986
It is nopt just Firefox. The whole KDE4 Desktop is laggy with nvidia too.
The nouveau driver provides a much bedder desktop performance.
As far as i remember tha nvidia driver was faster in that cases.
You're right. The whole KDE4 experience under Nvidia drivers is literally torture. Slow and buggy. However for me the nouveau drivers can't handle dual-link DVI well yet.
I had to use the Nvidia drivers to initialize the card into dual-link mode and the switch the the nouveau drivers. The screen would get corrupted after a while.
Switching to Radeon HD 5850 soon. Don't know how they will behave under KDE4 but since they're open source people can work on them and fix the problems quickly.