Epic Games and Nvidia has a deep partnership to optimize the engine for Geforce cards. We're doing our best to optimize the game. This is a lot of work and we are a small studio. So we're not able to optimize as lot as AAA Studios can do.
Is that means the engine itself has been optimised by NVIDIA? I hope so, and believe that CBS: Berlin can be better at optimisation.
BTW, which AO will be used in the new CBS? SSAO or HBAO?