I've set up sunshine + moonlight on Fedora KDE Wayland, and I've played remotely from a different country with unnoticeable input lag (using a gamepad, playing Cyberpunk). The whole thing is even behind WireGuard.

I have very fast internet on both sides, both fiber to the home, with only the tablet running moonlight being on WiFi.

When you say game streaming, is this the steam streaming stack?