While using Ubuntu 12.04 I have poor performance in video playback on a Nvidia Riva TNT2 (NV05) Video card with 32MB on board.
When using Ubuntu 11.04 and activating through Jockey the Nouveau-Experimental 3D driver I have gives best performance. I can even watch the HDRip 720p movies.
Can someone help me? I could provide whatever information you'll ask concerning my problem. Can't find info on the web.