Yesterday I've updated the system and now Plasma and some apps (Dolphin, KInfoCenter, Discover, Gwenview) start up very slow (up to 1 minute !!!).
Before the update all started up in seconds.
Searching in log files leads to nothing strange.
Has someone the same issue or can help me to solve the problem?
Thanks.

System:
KDE Neon 5.21
KDE Plasma Version: 5.21.4
KDE Frameworks Version: 5.81.0
Qt Version: 5.15.2
Kernel Version: 5.4.0-72-generic

Today all things are starting up to normal speed.
Very strange behavior !?!