HITMAN (or rather, its prologue) came out just over a month ago and was received pretty well overall, WCCFtech review included. The game was also one of the first to introduce DirectX 12 support on PC, but the gains were minimal on AMD and non-existent on NVIDIA.
We’ve had the chance to inquire about this specific topic with IO Interactive’s Lead Programmer Jonas Meyer, who mentioned that the fabled 20% CPU performance and 50% GPU performance boosts advertised by Microsoft are possible, but only in time and after dropping DirectX 11 support entirely. HITMAN itself was more of a straight port to DirectX 12, for instance.
Read more: http://wccftech.com/hitman-lead-dev-dx12-gains-time-ditching-dx11/#ixzz45v3zraRp
Interesting stuff in the article, it was only a straight port from DX11 to DX12, and dev doesn't have any news of better Nvidia Async Compute implementation.