The real key here is to keep bandwidth dedicated to the game, and to not have lower priority traffic stealing bandwidth. With such low data requirements for online gameplay, getting a faster internet connection is unlikely to yield significant benefits unless there are other simultaneous users on the connection. Gaming, on the other hand, consumes data on the order of 20MB to 80MB per hour of gameplay, depending on the game. Video streams such as NetFlix can consume 3GB per hour for high definition video.
