Originally posted by Elaborate Corpse:

i'm finding the same with friends as well since the update. we are playing without mods. The game lags so hard (and we've never had that issue) plus heaps of disconnects

Another important distinction here is if you ever modded.
Are you unmodded now but have modded in the past?

Frankly I have not tried multiplayer since the update so I don't know about the issue. But if you want to report it as a bug it is best to be as clear as you can about it.