I'm wondering if the network changes for 4.0 have a big performance impact?
As for Unity 3d we have a mirror/litenetlib/fishnet, will network solutions in 4.0 be on a similar level?
I am planning to create a simple 2d mmorpg game with grid based movement. Basically something similar to Tibia. Let's say to create a similar game I will need a server written in a different language?