> It should be noted that AppImages tend to be noticeably slower at runtime than other packaging methods

'Noticeably slower' at what? I've run, e.g. xemu (original xbox emulator) as both manually built from source and via AppImage-based released and i never noticed any difference in performance. Same with other AppImage-based apps i've been using.

Do you refer to launching the app or something like that? TBH i cannot think of any other way an AppImage would be "slower".

Also from my experience, applications released using AppImages has been the most consistent by far at "just working" on my distro.