Many Linux versions perform considerable worse than their Windows counterparts.
While that may be caused by an inefficient DX to OpenGL wrapper, driver optimizations also play a big part of the story, similiar to Windows.
Mesa has also done something similiar in the past:
https://lists.freedesktop.org/archives/mesa-dev/2016-August/124955.html?source=gol
Now I know NVIDIA has worked with Feral Interactive in the past, but are they also optimizing for their games?