> I think it does not support my card (lspci tells it is a "G98 [GeForce > 8400 GS]"), and nvidia proprietary drivers do not work with xen (which > I use). I think they did something recently to enable proprietary drivers with a hypervisor, won't give you any details but it had something to do with introducing their Tesla machines. > But if it is CPU only, how can the performance be so different between > x11 (mplayer taking around 20% CPU) and gl/gl2 (mplayer's CPU use >90%)? Basically with gl you're doing the same thing twice, first on GL level, then doing it on X protocol level.