Unreal engine advance session is unusable(to much multiplayer lag)

Why the advanced session is so terrible? When I connect 2 players across steam the server is fine of course, but the client get massive rubber-band lag when start to moving. If the server has higher fps the problem become stronger. The network usage is 0%. I tried everything but here is no way this to be fixed, this is problem with the engine. For years no one can found fix for this problem, why? It’s impossible to make multiplayer game with unreal engine.