The mouse movement in-game feels really smooth and nice, but it doesn't feel like what I'm used to (Raw Input, Direct Input) when it comes to other games like CPM.
I took some screenshots while using Mouse Movement Recorder comparing the in-menu mouse movement to the in-game mouse movement.
http://imgur.com/a/tRoZh
I used the following parameters for MMR:
MouseMovementRecorder.exe -alwayscatchup -showcatchupdelay
The in-menu mouse movement is perfectly fine, but the in-game mouse movement shows pixel drops (green) and a cathcup delay of 500 microseconds.
Link to Mouse Movement Recorder:
http://donewmouseaccel.blogspot.com/2010/04/markc-mouse-acceleration-fix-builder.html
You're going to want to download the "Acceleration Fix Builder @ google drive"
It comes with registry fixes, MMR, and MMR's source code.