Slow render framerate on second screen, 10.6.8 and Max 6.0.5 or 6.0.7

Hi,

I experience very low framerates (at least half) on me second screen when I set the jit.window to fullscreen. I am using 10.6.8 and have tested it with Max 6.0.5 or 6.0.7. Here is the test patch:

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.

Is there a maximum for the Jitter window?