I have a Dell XPS M1530 laptop with an nVidia 8400M GS and I also see very poor performance in Ubuntu 12.04. I see high CPU loading when moving windows, switching between virtual desktops, etc.
I have a Dell XPS M1530 laptop with an nVidia 8400M GS and I also see very poor performance in Ubuntu 12.04. I see high CPU loading when moving windows, switching between virtual desktops, etc.