Forums - CD PROJEKT RED

Why the developers decided to use only Directx 12, for I understand to add ray tracing, but the game is poorly optimized. Directx 12 worst api.
I've played all games with Vulkan api support, they have the best performance I've seen stable 60 or more fps, I really ask the developers to add support for Vulkan api.
Sorry for my english.

My PC:
i7 3770k
12gb ram
GTX 1060 6gb
Windows 10x64 20H2