Whoever thinks the lag is 3arc's servers is, well... a dumb ass. CoD is p2p, meaning there is a host sending the game packets to everyone else in the game. If one person in the game has a shit connection, they can cause lag for everyone in the game, because the host will constantly resend the dropped packets to the person with the shit connection. On top of that, the game also has its own faults in the code, such as the "Cant spawn zombie entities" error im sure many people may have seen when zombies are mowed down via a "rape train" in the later rounds and a new batch of zombies start spawning on the map.