Vulkan has lower FPS than DX11

Vulkan has lower fps than DX11 on the same settings.
Playing on Vulkan with Global Illumination is impossible since fps drops below 60 and I get a lot of screen tearing when moving.

DX11 (no Global Illumination): 135 fps
Vulkan (no Global Illumination): 107 fps

DX11 + Global Illumination: 74 fps
Vulkan + Global Illumination (with or without VSync): 55 fps

No screenshots for DX11 because they don't capture FPS overlay in the corner.

Pretty sure this is because of Nvidia's vulkan implementation, and would be by design. not a bug.

I also own a 1080 TI and can confirm similar even on nvidia's 1.2 vulkan beta driver.

These cards were not built with vulkan in mind, compared with AMD/ATI's cards, unfortunately.

I think the gap in performance should get smaller as support for this renderer improves, but part of this is because of the Pascal architecture isn't great for Vulkan.