I have encounter exactly the same problem, and it is solved in execatly the same way as you did.
This is just the way in ArchWiki: KDE - ArchWiki
However wayland is not slow anyway, some env:
- Nvidia GTX 1650
- Linux 5.13.11-1
But I have another problem, fonts in chromium blurs, 4K monitor with 200% scaling, a screenshot that might not be able to illustrate the problem:
EDIT 1
The problem of blurry fonts in chromium is solved by following the ArchWiki:
https://wiki.archlinux.org/title/Chromium#Native_Wayland_support
BTW the icon for chromium changes for wayland
No blurry at all, but the startup takes much longer time, I think it has not been optimized yet.
When playing a same video in chromium using xorg and wayland, wayland is slower considerably, cpu usage roughly as below, also not optimized enough
- xorg 10%~15%
- wayland 15%~20%