I bought the game back in march, but there were so many issues that it was basically unplayable, so I decided to wait. Installed it again about a week ago, applied the patch and it ran okay. The frame rate was a little below fluid (maybe 20 fps, I don't have a program that shows exact fps installed right now). But now framerate's down to maybe 10 fps again and I have no idea why (I didn't chage anything, didn't update my graphics card or anything).

I tried assigning the game to a single processor, but that doesn't help. Dissabling SLI, as was suggested in another thread, isn't possible with my Geforce GT 640, afaik. Anything else I could try?