Framerate drops randomly after loading previous games

[WhiteKnight]

Hi,

After loading a previously saved game, I notice that even if not moving anywhere in the game, the FPS will start at 60 and then for no reason drop to 57 or 55 FPS which will cause a stutter. Keep in mind, I am not moving around anywhere in the game, after loading a game, I watch the FPS and usually after 20seconds or so, i see the FPS drop to 57, 55, etc. If I am moving in the game at the time this FPS drop occurs, I notice the stutter. What is the reason for this? When I look at the Task Manager, it looks like the memory is increasing slightly when the FPS drop occurs. But even if the FPS drops to 57 or 55, i dont think it should stutter, shouldn't notice a stutter prolly until the FPS drops to below 30. I have tried disabling Aero and it doesn't seem to make a difference. Also, I tried disabling all non-MS services and starup items through msconfig and didn't make a difference either. Finally, I set ALL settings to the lowest they could be (i.e. SSAO off, Low textures, 640x480 resolution, etc) and this problem still exists so seems to me like a problem with the games programming. Is this some problem related to buffering or something else that can be tweaked. I am attaching my main_settings.cfg file for your review.

My specs are as follows:
Intel I7 950 3.06 Quad core (stock settings)
Corsair Dominator DDR3 DHX 6GB 1600MHz ram 8-8-8-24 timings
Windows 7 Ultimate 64-bit
EVGA GTX 480 1.5MB
EVGA X58 FTW3
OCZ Vertex2 SSD