From outside it's hard to tell if it's truly protocol differences or just the age of the implementations on X11, but when Wayland came out every project has claimed improvements over the old X11 stack. Also, from the early Wayland days presentations bashed the protocol as something that couldn't be fixed without a rework that was not going to happen due to the dead weight of backwards compatibility and awful older hardware.
As a user applications running on Wayland have consistently improved on how nice things feel if you don't miss your latency deadlines. It's easy to perceive on apps, and straight out obvious in games.
https://github.com/ValveSoftware/csgo-osx-linux/issues/3856
From outside it's hard to tell if it's truly protocol differences or just the age of the implementations on X11, but when Wayland came out every project has claimed improvements over the old X11 stack. Also, from the early Wayland days presentations bashed the protocol as something that couldn't be fixed without a rework that was not going to happen due to the dead weight of backwards compatibility and awful older hardware.
As a user applications running on Wayland have consistently improved on how nice things feel if you don't miss your latency deadlines. It's easy to perceive on apps, and straight out obvious in games.