lag on box select?

I’m having this problem where occasionally blender fps drops to something horrible when I’m trying to box select, it only happens then, and the problem goes away when I go fullscreen.

BTW, I’m running 2.36 on Windows w/ dual monitor

it is specific to the graphics card, but I get similar issues

I think it has something to do with the “ati bug” … using glfinnish instead of glflush…