So, basically SWB2 plays totally okay when in singleplayer mode.
But im only get laggy mouse movement (not only aiming, but pointer in menu, too), even when i am host
And it happens only and only when i create or join online (internet or lan) game.

https://steamcommunity.com/app/6060/discussions/0/1488866813770626421/ - this dude totally described exactly the same problem. Anyone know how to fix it?