200Dpi and 3.0 mouse axisX&Y in user.ini, that fixes the floaty unresponsive feeling that UT has.
mutate ace highperftoggle on(completely locks fps)
FPS limiter 180
Vsync off.
Code:

MouseX=Axis aMouseX Speed=3.0
MouseY=Axis aMouseY Speed=3.0

Ut shortcut: C:\UnrealTournament\System\UnrealTournament.exe -cpuspeed=4000
(CPUSPEED must be changed to your cpu max freq)
Or make a bat file, and place it in your system folder:
unrealtournament.exe -cpuspeed=4000