I have been using 11.04 on my Compaq Presario CQ56-116SO. I have used Ubuntu from 9.10 version, and all have been working perfect, no lag etc.
But now, when the 11.04 was released, I installed it, I installed my ATI drivers (I play games like Urban Terror so i need those drivers) but oh my god!
All lags in 11.04! Well when I don't have any programs running it doesnt lag, but when I open apps like Nautilus, aMSN, etc., and they are open at the same time and when I move windows it lags like hell, and this will piss me.
I never had lag with other versions! I even tried to use Classic Desktop, all lags there too, same bad peformance like in Unity.
What is wrong with 11.04, why it lags with an HD 4250? In older versions all worked without lag, effects etc., no lag. But the 11.04 is a pain.
Any fix for this? Disabling VSync and Detect fresh rate makes it run much better, but I still have huge lags. Hope the 11.10 fixes this. When I buy a new computer I'm gonna buy a computer with an NVIDA graphics card, my friend got an 8800GT and he don't have any lag in Unity.
I even have tried 11.4 ATI drivers, no help.