Combat FPS Falling to 1

Whenever I enter combat, or break atwig tower and create a lot of GIBs, my gameplay freezes for 10-30 seconds below 1FPS. This usually ends up in me dying and getting frustrated that this aspect of the game is still unavailable to me. Thus far i have experimented with all graphics settings ranging from max to minimum, this has a great effect on normal FPS ranging from 30-60 FPS in normal mode, but once combat begins it still crashes.
I am running Windows 7, an i7 920, 18 Gb RAM, Geforce GTX750 2Gb, all the most current drivers.

Please help, I really enjoy this game and am very frustrated.