So my friend and I enjoy playing this game together, however the network latency is killer and makes it painful for us to play. It takes anywhere from 15-30 seconds for the game to register an order and subsequently move that ship I ordered to move. Same with every other aspect of the game. So where my turns might take 20-30 seconds in my single player, they now take several minutes in my multiplayer. 

I currently live in Japan, and my friend is in the U.S, so I understand SOME latency. But we play lots of MOBAs together with no latency. I also understand that those have their own servers hosted, but even so the latency is not right. We also use voip, and there's no latency on that, either. 

I would appreciate help solving this networking issue. For instance, are there particular ports we can open to speed things up?