Stuttering with a GTX 670

[Mr. Plankton]

Alright, here is my latest HPL log. Everything on max (SSAO samples set to 16, using FXAA via the CP instead of the traditional AA option, playing at a 1920 X 1080 resolution, "prefer maximum performance" also set in the CP). I just ran to the location where you assemble the orb and there was a good deal of stuttering, particularly when opening the first door to enter the main room, when the monster appears and walks away, etc.