Windows 10 vs. Linux OpenGL Performance On Kabylake - Summer 2017
Xonotic with low quality settings at 1080p showed Windows running faster than the Linux distributions. The fastest Linux distribution tested in this test profile was Clear Linux while Windows 10 maintained a 6% lead over it or a 15% lead over Ubuntu.
But when moving to higher visual settings where the game becomes more GPU bound, the Clear Linux and Windows 10 performance about evens out while the other Linux distributions are within frames of that.
When maxing out Xonotic's visual capabilities, the Windows vs. Linux OpenGL performance is nearly identical.