Is there a limit to the framerate on this display with its current driver? I can't get consistent 60fps at 800x480, tested with mame4all and pisnes using dispmanx/GLES and its triple buffering. It hovers around 55fps.
No problems with consistent 60fps on a normal HDMI display.
Update Press F9 in mame4all to switch off autoskip and it runs smooth at 50fps although game runs slower.