1. Start Up Combat Arms (In Administrator Mode for Vista)...
(If you have vista and its running as admin then your done but if you have xp keep reading...)
2. Ctrl+ Alt + Delete for Task Manager
3. Game Start..
4. Once It starts Alt + Tab Out of Game.
5.Right Click Combat Arms in the task manager and click "Processes".
6.Right click Engine.exe and change the priority to HIGH.
7.Alt + Tab back into combat arms and Kill with LESS LAGG!!
I hope This Helped..
P.S. Me and a friend are making a program for less lagg.. Hope It goes well!