I've noticed the app icons take several minutes or more to display in Ubuntu 21.04. Was instantaneous in Ubuntu 20.10. Each time after I login to Ubuntu 21.04 clicking Settings speeds the population of the launcher bar with icons. Going through this process once is usually enough. One suggestion was removing tlp (power management of some kind) except I didn't have this installed. How should one resolve this issue?
Each time after I login a clear but empty ribbon is displayed with nine dots (Show Applications), at the bottom, on the left of my screen. I waited at least 5 minutes and no app icons appeared. Bringing up Settings eg. Screen Display caused app icons eg. Firefox, Thunderbird Mail, Files, etc. to almost immediately appear. This has to be done every time I login not just the first time. This behaviour started after upgrading from 20.10 to 21.04. This still occurred May 20th. All updates applied. Considering using Gnome 40 but haven't. Tried
sudo apt-get install gnome-menus --reinstall and
sudo apt-get install gnome-shell --reinstall from terminal window followed by a system restart. No change.
I observed, on another laptop computer, June 6th the 21.04 release upgrade from 20.10 worked without this issue.