Do the clients need different ports?
They are behind NAT. I tried portforwarding the standard port when we were playing with 3 players but that didnt change anything for the lagging.

I also just rerun the test with 2 computers and now it seems to work, but both clients show pings of 0ms even though ...

Hello,

I just recently bought factorio and i started playing it with a friend.
At the beginning anything was working well (No lag / desync at all for about 30 hours of gameplay), but when a third player joins the game started lagging heavily (debug mode shows a watch next to the ping, so it seems ...