I use Unigine Heaven to benchmark Linux systems. A colleague's friend has an epic spreadsheet of Heaven benchmarks across many configurations, and he submitted a few I've done. I ran it at home on my Linux desktop. For shits and giggles, I also downloaded the Windows version and ran it in Proton, and got a 30% performance boost! I suspect that a lot of that is due to the dxvk library that Proton uses, and the multithreading that it introduces translating D3D11 calls to Vulkan.