When I run this patch in fullscreen on my main monitor (press esc to toggle fullscreen), the framerate is 60 fps. When I run it in fullscreen on my second monitor the framerate is 30 fps. Why? There is no warning in the Max window.
But, if I bring the resolution down (from 1280 to 1024) of my second monitor and then set the patch to fullscreen there, everything works fine.