It's capped at 30 fps, however you can change it to 60fps
PHP Code:
capfps(int) function (0-> no fps cap , 1->cap to 60 fps, 2->cap to 30fps) , by default rendering is capped to 30fps
if you was to use something like 60FPS you would have to redo the entire server virtually for the true 60 fps feel, since graals original client is capped at 20fps.