Guys there is a way to increase the performance on AMD Cards by disabling some of the NVIDIA gameworks cripplers
Volumetric Lighting set to 0 and God Rays set to 0
Fallout4.ini -> God Rays
Fallout4Prefs.ini -> volumetric lighting
Set your tesselation to 8x aswell in CCC
Has helped me!
Called it!

Yup, my money is on that being the reason just like the witcher 3 except instead of over tessellated hair, we now have over tessellated light raysPointless amount of tess. for very little to no real visual benefit...