Okay so I am having the exact same problem as this http://forum.toribash.com/showthread.php?t=332339
He seems to have gotten it fixed but I cant seem to get mine fixed. So anyone have a solution?
Frame rate drops horribly when menus like options or the mod list are open, Or when I start to type, Its goes back to normal when I push escape though.

Processor: Intel(R) Core(TM) i7-2670QM @ 2.20 ghz
RAM: 6.00 GB
64 bit Windows 7