Can someone post what you can shut down in your processes, or what you must leave running to improve your game play. So as to increase your ping/stop lag?
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If you can't stand bullets flying past your head, you shouldn't be in the military!
click start click run click services.msc and close down things you dont need from there - e.g wireless. put them in manual mode
to stop lag... make sure your fps doesnt vary, cap it so it doesnt move around much. if your computers struggling to reach a better fps it can affect your ping
the biggest one which lets a LOT of people down is their mouse acceleration. Windows XP includes mouse acceleration by default, which means moving your mouse a certain distance can vary how much you move on screen. It may not be much but its enough to miss a vital headshot. You can stop that happening by using the following program
Its removable, if you dont like the effect (it will make your mouse feel a little slower - you can adjust your sensitivity to compensate) just run the program again