New answers tagged opengl
Did you check if 3d is enabled? glxinfo |egrep -w 'rendering|renderer' If you read something about "raster" or "no",then is not enabled. Even if enabled the opensource driver are good,but there is a lot of work to do to reach at least for old cards the same performance of the nvidia proprietary driver. Is not clear this "OpenGL vendor string: VMware, ...
In wiki page of Xvfb it says:" Unlike a real display server, Xvfb does not support modern X11 extensions like compositing, Randr or GLX. Xdummy is a newer alternative which supports these extensions as well as providing the same functionality as Xvfb."
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