Hello there,
at first my system:

AMD Fx 4100 4 x 3,4Ghz
8 GB Ram
Geforce GTX 660 Ti

The multiplayer runs really good and smooth on high settings.

But the singleplayer: stuttering everywhere, most on places with much grass. I testet ANY option from low to high and it is absolutely unplayable (5-10 FPS I think). An yes, I use the actual driver and I turned off some effects in an autoexec.cfg. But it is stuttering... Can someone help me...pleaaase!? -.-

*push*