AMD Radeon Linux Gaming Performance At Parity Between KDE Plasma 6.0 X11 vs. Wayland
DiRT Rally 2.0 running under Steam Play showed no performance difference between GNOME vs. KDE or X11 vs. (X)Wayland environments.
The open-source ET: Legacy game worked equally well across all four environments.
The F1 22 and HITMAN 3 games running under Steam Play showed the KDE Plasma 6.0 performance with the Wayland session working out as well as X11 and matching that of GNOME.
The KDE Plasma 6.0 experience overall was great and in my testing hadn't run into any Wayland issues with the shiny new desktop.