You might be playing Black Ops, Bad Company 2 or Team Fortress 2 online; or maybe you're ploughing your way through enemies in Crysis 2, Fallout: New Vegas or GTA IV. It doesn't matter what the game is, or whether you're playing multiplayer or singleplayer - at some point the dreaded word Lag will be used. That one word sums up a world of frustration for PC gamers everywhere. But what exactly causes this periodic lack of responsiveness in a game? Is there any way to get rid of it, or at least reduce it? Let's get to the bottom of this annoying phenomenon