Barrier - Keyboard and mouse sharing via network - I use this extensively and the break in compatibility is destructive for me.
Barrier has been unmaintained for a while now. The two active forks are deskflow (upstream) and input-leap. Deskflow has limited supported for Wayland. It seems that they're working on resolving the remaining issues: https://github.com/deskflow/deskflow/discussions/7499
I have 3080 and I've seen significant performance issues too (e.g. in Cyberpunk 2077, KCD2). I think it depends a lot on the games you play. Apparently DX12 (via vkd3d) doesn't perform well on Nvidia cards.
My next GPU will probably not be an Nvidia card.