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Currently glXCopySubBufferMESA is used for sub stage redraws, but in case a driver does not support GLX_MESA_copy_sub_buffer we fall back to redrawing the complete stage which isn't really optimal. So instead to directly fallback to complete redraws try using GL_EXT_framebuffer_blit to do the BACK to FRONT buffer copies. http://bugzilla.openedhand.com/show_bug.cgi?id=2128