High input lag with VSync (GSync) enabled

[YelovSK]

Your system information

• System information from steam (Steam -> Help -> System Information) in a gist: https://gist.github.com/YelovSK/72dcb3d8de102dd3955d280f6100e0d1
• Have you checked for system updates?: Yes
• Are you using the latest stable video driver available for your system? Yes
• Have you verified the game files?: Yes

Please describe your issue in as much detail as possible:

When using the DX11 API, having VSync enabled (both in-game and in nvidia control panel) and nvidia reflex + boost enabled provides very low input lag. When using Vulkan with the same settings, input feels quite a bit slower.
GSync is enabled and shows GSync compatible indicator in-game (toggle in control panel: display -> g-sync compatible indicator).

Steps for reproducing this issue:

1. Launch DotA with the vulkan launch option
2. Enable VSync in-game (and in nvidia control panel + enabled gsync)
3. Input feels sluggish compared to DX11