What about DirectX 12 in game. D3D12 have much better performance. But in NVIDIA WXGI Demo is more laggly than older D3D11 In D3D12 game Ashes of the Singularity i have 4 FPS better performance than D3D11. In many Unreal Engine 4 demos i have in D3D12 worse performance than D3D11. DirectX 12 is trying to skip processor in many graphics tasks, and we know that in BeamNG processor is very important. So should be better performance than the previous libraries.
dx12 will make huge improvements but dont expect it to be widely adopted for another 2 years minimum. im in the minority of people with a dx12 compliant card and its important to make the game better for the majority.
If DX 12 ever comes to BNG, I'm ready as I have W10 and a AMD ASUS 380X which is a DX12 compatible card.
