SolarPunkerFlatpak Firefox (and forks) very slow to start
GolfNovemberUniformI noticed this too on my slowest machine. I guess you should just use native packages or other formats to fix it (as the other person said). I’d stick with Flatpak if possible though. It’s more secure
Anything else works fine, the only other problem I’ve noticed is that some GTK applications don’t respect the KDE Plasma theme (in my case only Quod Libet).