Hello!

On openSUSE Leap 15/KDE Plasma 5.12 LTS Network Manager connects to Wi-Fi very
slow on system start/restart/logout and login. While it tries to connect t othe
defined network the update checker already performs its update check and gives
an error notification that there is no internet connection.
I found the reason - because by default Network Manager stores the
name/password for the current user only in an encrypted way and I assume it
needs more time for decrypting. Workaround is saving the password in
unencrypted way (for all users) but for me this is a drawback and it should be
fixed.