"The person with the worst network throughput is usually the one who is causing desync. The game is sending huge data packets and expects all to be received in time."

This has been driving us nuts, we are giving up on the game as it has gotten worse since the last update. If we are in the same map area, we just can't play together which is the point of "playing together" :-)

I read the developers notes about how multiplayer works and it appears that the server doesn't do the mechanics, but the client does. Therefore, when you are by yourself on a map everything happens instantaneously but as soon as a friend gets near doors go wonky, monsters hop around the screen, or you do no damage or take ghost damage. The reason it goes wonky is that you or your friend are processing the game mechanics and then relaying the output via the server to each other. It is a whack way of doing it, great when you are by yourself as the game is lag-less but when playing with friends it is a nightmare.

The game is designed to be multiplayer but not to play together.