First of all, I know xWayland already does this when in a Wayland session but RPCS3 (PS3 emulator) runs disgustingly bad inside Wayland on my PC, and during an Xorg session the same emulator runs perfectly, and it’s not a FPS issue or framerate, it is a problem that any game is simply unplayable because it suddenly gives stutters that do not exist in Xorg.
KDE Plasma honestly feels extremely buggy and slow on Xorg and so I don’t want to use Xorg, I would like to use Wayland and not have to log into an Xorg session every time I want to use RPCS3.
Now, I am using KDE Plasma 5.27 with Wayland and using Nvidia proprietary drivers (515).
(If Linux4Noobs existed on Lemmy I would have posted this there)
Maybe you can try running the application with QT_QPA_PLATFORM=xcb. I have to do so for Webex for my work, since it won’t run properly on Wayland. You can edit the application’s shortcut in KDE and set environment variables in the Application tab.
I tried but still I have the same problem… Probably Nvidia related.
Also try unsetting
GDK_BACKEND