I'm running them in OpenGL now. I don't get more then 30fps on my master andd 15fps on my slave. This also seems to switch when i set focus to the slave box.
So not ideal no, but playable. Tbh I can't see much diffrence when playing at 30fps or 50fps, but maybe that's just me.
It's worse in towns tho, or the moment i run another app in windows. If i had the recources i would buy me vista probably.