Lag is a term indicating the latency of an internet connection, mainly to the bad. More lag indicates a longer time for your game to communicate with the game server, and thus a higher amount of lag indicates slower responses. Next to each player's name you may see a colored lag indicator which shows how good or bad that player's connection is. There are 4 icons: Excellent Connection (very low lag), Good Connection (low lag), OK Connection (some lag), Poor Connection (high lag)