Our game actually ships on Windows, macOS and Linux (as well as the two dominant mobile OSs), so I dabble in all of those platforms. The Linux OpenGL performance is indeed better than on Windows, but unfortunately it makes up only a super small fraction of our userbase.

I should note that the OpenGL stack on macOS isn't better than the Windows one either. Probably not surprising anybody, given the lackluster support that Apple has for it. We are seeing similar improvements with Metal as we do for Vulkan.