For years, I think since 11.1, switching users have been painfully slow.
I've believed it to be a nvidia bug with my geforce240 card.

But it is solved with this little plasmoid gem:
https://build.opensuse.org/package/s...home%3Azpintar

I'm not sure other users have experienced this, but it has been a pain for years
Now we finally can keep all our user logged in.

Thanks Zarko Pintar