Incredible lag spikes in multiplayer.

[Daddy Cool]

In a multiplayer session, even without any vehicles or anything loaded in, the game suffers massive network instability leading to some pretty fustrating rubber banding and stop/starting issues that make it pretty much impossible to play.

Host internet is fine and my internet, whilst it isn't great, is more than capable of supporting a stable connection. Is this a known issue, or can something be done to make the game function in a stable manner?