Mouse cursor is too slow

[Alxaro]

Hey, I just got R:TW and installed it + patches, but whenever I try to play it, the mouse cursor don't follow my movements fast enough*(read standard speed) It's not like that in the menu, just ingame on both battle and campaign map.

Is there anyway to fix this?

[D.B. Cooper]

I got that on my old computer, and I'm assuming it's simple lag because my specs weren't too high and it went away when I turned the camera away from a big battle. Turn down the settings.