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Arch and other Linux operating systems Beat Windows 11 in Gaming Benchmarks
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
They were using Proton, so most likely X11 as their windowing system. I'm guessing they were using the default distro kernels as of November 15, 2023 (when they ran the benchmark), but I don't think the article said for sure.