Claas Langbehn wrote: > $ glxgears > [...] > 4034 frames in 5.0 seconds = 806.749 FPS > 3855 frames in 5.0 seconds = 770.863 FPS > > with 100% CPU usage. Is that normal? Yes, glxgears does busy-waiting: it continously waits for the GPU to finish its last command. For reference: http://en.wikipedia.org/wiki/Busy_waiting Benno