there’s A LOT of levers that can be fiddled with, but there’s some settings that fedora tested out that popos and arch use/recommend
https://wiki.archlinux.org/title/Zram#Optimizing_swap_on_zram
/etc/sysctl.d/99-vm-zram-parameters.confvm.swappiness = 180 vm.watermark_boost_factor = 0 vm.watermark_scale_factor = 125 vm.page-cluster = 0
There’s a section set aside for Itch but I don’t think anybody has added any yet https://github.com/Open-Wine-Components/umu-protonfixes/tree/master/gamefixes-itchio
a concerning trend, they fingerprint the hardware of approved handhelds (Deck) instead of just letting Linux players play