Life moves pretty fast in a Call of Duty multiplayer match. One second you’re running toward a doorway, M4 in-hand ready for anything, the next you’re watching a replay of someone shooting you through a window from 200 yards away. You may however have noticed a subtle improvement in your ability to spot this sort of danger between the launch of the Modern Warfare 2 beta last month and the arrival of the full game. Sadly, it might not be completely down to your improvement as a player. You thought you played the beta to test the netcode and server performance, right? No, not quite. There was something else going on.
