I've been playing the game for 40 hours by now in a quite tryharding mode.. x)
I noticed one problem which was the most annoying in my opinion. In a multiplayer game, we have explored a lot the earth planet and so we have made a really long oxygen line. The problem is that now, when we add a new tether to the chain, the game freezes for like 1sec. I believe the problem is the "animation" of the tether linking to the whole big chain. This problem isn't happening in other planets in which we don't have a long oxygen line.
Thanks for considering this. :)