Comment by eigenspace

It typically will only outperform Windows *if* you are running lower-end hardware. The main thing here is that when running on Linux, your game is typically in less contention with the OS for getting access to CPU cores and RAM.

If you have a beefy CPU and plentiful RAM, then typically one should expect Linux to be slightly behind Windows performance (though there are exceptions), because then Windows' bloat becomes a non-issue, and the impact of the translation layers start to become more significant.