My cousin is having the same problem. He have a good connection, we play lots of other games online without lag. I tried using hamachi, using direct ip and using the master server, but it always lag. If he is not moving, the game looks fine for him, but when he moves, it lags(and only for him). When I pinged him in the game, it was like 202 or something(in the hamachi when I ping him, is like 80 or something most of the time...). Even when we both enter on the same server of somebody else, my game is normal and he is lagging. He uses Windows Seven 32 bits, I think it's the Ultimate version. We tried the version 2.0.6 and the 2.0.5, but it happens on both.