Performance in City is very Hardware depending an AMD Six Core isn't any more performant if compared to an AMD Quadcore with the same clock per core.
In my Opinion it would be a really good longterm revenu if Bohemia would bring the engine to a new mantle & Directx12 & OpenGL using game.
I think this game & Graphicsengine can do realy big if these performance problems are solved.
Happy looting
Dayz for Linux go for that too plz
A good game takes time