Ok, then we'll make it straight forward, out of the 52% gain from openGL to Vulkan that computebase.de showed with the FuryX, roughly how much of that gain is from async, how much from instrinsic shaders, then how much from multi-core rendering, etc?
Oh and most important, how much from Vulkan vs OpenGL (in particular from not using the OpenGL driver from AMD, which seems to be not particularly optimized).
Check this comparison:
https://www.youtube.com/watch?v=P_I8an8jXuM
Apparently there is much more to OpenGL vs Vulkan/DX12 which is impacting performance than just "intrinsic shaders".
I'd say it is impossible to break down sources of performance gains and anyone claims the contrary is just spreading FUD. (Aside of course ID software, which most likely know the break-down more precisely)
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