game started crushing
error:
Assertion failed: !Primitive->SceneProxy
[File:D:/Build/++UE4/Sync/Engine/Source/Runtime/Renderer/Private/RandererScene.cpp] [Line:1221]
Primitive ahs already been added to the scene!
before it worked fine few days. i think it can be because i was changing some settings. i'll try to re-download fresh copy and see if it works. i'll edit this comment for result.
UPD. i think its something to do with Effects setting. its bad, cuz Effects on "epic" doing most laggs (mountain clouds do) and if i change it - crash.