If you can't do it in the options, then I'm not sure offhand really. It would be intergrated into the coding, and when you think about how many characters and classes, spells and whatnot are out there, thats a lot of code to just have one check box to shut off.
Try lowering some of the options in the video screen to increase your performance. Its the only thing I can come up with right now.
__________________
|