Radeon Windows 10 vs. Linux RadeonSI/RADV Gaming Performance
Civilization VI came out for Linux just earlier this month and was ported by Aspyr Media. On Windows there are D3D11 and D3D12 options while Linux has just OpenGL support.
Even with minimum quality settings, the performance on Ubuntu with RadeonSI Mesa 17.1 + Linux 4.10 was just about a third of the windows performance -- just above 30 FPS with Linux.
The ultra quality settings didn't help out the Radeon Linux gaming numbers at all.