I have an almost identical machine using fedora 34 and gnome and never see any delays of that type.
It may be related to something in KDE/plasma/KWin and the settings panel that loads up the display info, but certainly does not affect my gnome settings panel as you describe.
In an attempt to try to reinstall my nvidia drivers, I was able to fix this weird load issue.
I noticed there’s been failed system updates from fedoras discover updater.
I don’t understand why, so I decided to update from root.
sudo -i
dnf update
I noticed in the updates there was an (nvidia) package I didn’t take a note of the package because I rebooted right after the update. dumb of me.
After the reboot there was no failed system install and that fix my load issue on (display and monitor) settings.
I’m assuming it had something to do with that nvidia package that was installed.
After the update a ton of feature seem to be working better than before. I wonder what was wrong.
My memory usage dropped when running firefox and vscode. it was always roaming around 12gb of memory usage. Now I’m at 6gb usage what a significant change.
Is it bad to use the discover updater? Should I be updating from root?