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… When you are back in gaming mode or the default Steam Deck mode, go into a game's properties and select the Compatibility menu. From the drop-down, select the version of GE-Proton you just downloaded. GE-Proton improves performance in FFXIV based on my testing. …
… While there are some instability issues, it's no different from how the game performs on Windows; many of the same mods and loaders will work just fine under Proton, and the stock experience matches that of a stock Windows playthrough. …
… I did not have time to test this, but I will do it in the future. I noticed some other recent HD-2D games deliver more stable performance on Linux than Windows thanks to Proton. You could also push things down on Steam Deck, but the image quality is not good enough for me to get 60fps. …