For those of you who don't already have this and want to reduce lag for better in game experience get this!
Click this to download.
[You must be registered and logged in to see this link.]Its called Game Booster and what it does is first defrags your games (witch should be done every update, sometimes every time you wanna play) to take all the useless crap that will slow your game down.
Then it lets you switch to gaming mode witch will give you the option to close useless processes open that might slow your gaming down for an extra boost
Lastly If its still slowing you down and u need that little tiny bit of extra boost you could always open your task manager (ctrl + alt + tab usually) and go to the processes tab, look for explorer.exe and end it. This will close windows explorer down for no extra disturbances and also close some hidden processes you didn't catch with GB.
If you need any help let me know in this thread ill be glad to help
Credits:
Original owner of the thingy i guess
And me for showing those of you who didn't know already .