Yeah I had a similar issue, my Nvidia driver got updated to 545 and suddenly PRIME offload did not work for Steam games. After a little while Flatpak update pulled the nvidia 545 flatpak stuff and it started working again.

Not ready. Ella is working on it.
OpenGL is at 3.1.

Yeah, I disabled it and never notice any issues, but I only play BG3 and Guildwars2.

Panel freeze is a known KDE bug on non-Intel GPUs. It’s fixed in Plasma 6, avoid it on Plasma 5 by disabling window previews for the panel.