Wierd lag issue with tiberian sun HELP!

[hav0k]

Ok so i've decided to give the good old c&c series a blast for nostalgia and I cant figure out how to stop this lag issue, I can get the game to run fine but as soon as i move the mouse my fps drops to 1 or 2 making it unplayable, its perfectly fine if I don't move my mouse though..

[Tore]

Try this installer: http://tore29.com/tsins/TSinstaller-beta7r4.exe

 

It's a beta so it might have some issues.