Valve exploring a custom shader compiler on Linux that leads to significantly higher frame rates than native code on Windows: https://www.forbes.com/sites/jasonevangelho/2019/07/11/valves-latest-linux-gaming-work-is-boosting-amd-vulkan-performance-by-up-to-44-percent/
(Shader compilers run during the game, so compilation time can make a big difference.)