First of all a 300mbs connection should be enough. But its not the connection, its the game. Its poorly optimize. Runs bad. Im quite dissapointed too after waiting so long for this game. Sure its only the first beta and the devs have a lot work to do. For me its in a state that you cant play it. I have an i7 4790k and gtx 1060 6gb and i got 50fps with everything on low. So, lets hope the devs will work hard to optimize. If they will this will be a great game.