The mouse-camera control granularity is linked somehow to the framerate. Higher framerates lead to smoother and slower mouse-camera control. Lower framerates lead to choppy control that is "quantized", too fast and jumpy. I've encountered such problems on both old and new hardware. Besides framerate, part of the problem seems to be related to the audio renderer, of all things.
A popular way to automate this process is to create a .bat file, go to the game app's directory (using the cd command), then use either
StartAffinity Blade.exe 0
psexec -a 0 Blade.exe