Armored Core 6 and Minecraft.
Both on Linux, Armored Core 6 works flawlessly with proton. But Minecraft needed some more work.
I just finished modding Minecraft java edition on Linux with fabric to use my Nvidia card appropriately and it is running the smoothest it ever has at 60 fps, 128 bit resource packs and very high settings on my shader. Fabric is so much better than optifine in terms of performance, just wish it was a bit easier to install.