Here are the results with all patches (I did not install doxygen): ** rendered 9063 frames in 2.455 secs, 3691.650 fps ** rendered 9063 frames in 2.284 secs, 3968.039 fps ** rendered 9063 frames in 3.117 secs, 2907.603 fps NB: the value of "compression_level" remains as previously set, it does not change to the default automatically.