Unfortunately it broke some prefabs on custom maps (prefabs are custom road connections), but most prefab makers have updated their prefabs already, meaning you will need to update most custom maps for them to work in 1.11. Assuming you can run server files independently of your Steam ID like you can in Team Fortress 2, it could be very viable for a few friends to drive together and have a reasonably smooth experience. However, an online aspect maybe (hopefully) introduces the possibility of Coop with a locally hosted Server Side Client running on a local Windows based machine. Online you could see warping of both players and AI so I'd expect to see the same or worse from SCS as ArmA 2 is designed to be played online.
and ArmA 2 didn't run overly smoothly on anyone's machine. I think ETS2 does it better as it doesn't pop in as abruptly but overall it performs very similar in every other respect (at least to my eyes). I can't help but compare this game to ArmA2 a lot simply because of the way vegetation is handled as you approach it. I can certainly believe this because the game is far from running smooth even on singleplayer and considering it's rather low image fidelity.
I've heard by someone (I'm guessing Squirrelsnuts) that the game engine wasn't made for MP Gaming.
