それでググると

❯ qdbus org.kde.KWin /Compositor org.kde.kwin.Compositing.suspend
Error: org.freedesktop.DBus.Error.UnknownMethod
No such method ‘suspend’ in interface ‘org.kde.kwin.Compositing’ at object path ‘/Compositor’ (signature ‘’)
❯ qdbus org.kde.KWin /Compositor suspend
Error: org.freedesktop.DBus.Error.UnknownMethod
No such method ‘suspend’ in any interface at object path ‘/Compositor’ (signature ‘’)


Wayland is always compositing, so it doesn't have any purpose in the Wayland future Plasma 6 is designed for.

There's no such thing as "disable compositing" in Wayland, and there would be no potential performance benefit to doing so