I'm fresh Ubuntu user.
My PC is pretty fast (Phenom x4 3.6GHz/HD5770/4GB RAM) so i was very disappointed when firstly saw how laggy is the interface - lags when I try to move any window.
I think my problem is caused by graphics drivers but i have no idea how to resolve it...
I tried to install and uninstall fglrx on every way I found but it didn't help. It's the same both on x64 and x86 Ubuntu.
(Sorry if my English is bad ;) )
I installed Propierty Drivers from Ubuntu system settings (jockey?) And from AMD website through console - both were the same laggy.
I think those were the newest one - AMD Catalyst™ 11.11 Proprietary Linux x86 Display Driver
I have noticed that everything runs smoothly when I run Ubuntu from LiveUSB
Setting "Sync to VBlank" to off in Compiz Manager doesnt help too...