To NVIDIA users with stuttering issues:
I have done this and it has made my game run smoothly!
Go to Nvidia Control Panel
Program Settings, Select iw6mp64_ship.exe
FXAA - OFF
AA Gamma Correction - OFF
Max Pre-Rendered Frames - 1
Multi Display - Single Display Performance Mode
Power Management - Prefer Max Performance
Threaded Optimization - ON
Vertical Sync - ON
Hope it works for you like it did for me! Cheers!
Max Pre Rendered Frames should be 4.
did this correct both in game and lobby shuttering? also, what framerate are you getting with these settings?