Slightly slower mouse movement - not lagging but just a bit slower anyone else experienced this?

So I have a whole new PC (yay) using AutoCAD LT on it and it seems to be working great, snappy, fast, i'm happy. But then it seems to slow down just a tad on the mouse, almost its really smooth but slower and takes half a second more to get where it is supposed to go? I feel like I am going insane trying to understand whats going on with it as i can't find anyone else with this issue.

It feels like I am playing a game just under 30fps where it looks smooth but you can tell its not right