Comment 1 for bug 1946061

One more hint, possibly helping to narrow down the cause:

I have these lines at the end of my fstab:

LABEL=Taranis /media/bernd/Taranis vfat rw,nosuid,nodev,noauto,relatime,uid=1000,gid=1000,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,showexec,utf8,sync,errors=remount-ro 0 0
UUID=E098-2BE4 /media/bernd/sdcard vfat rw,nosuid,nodev,noauto,relatime,uid=1000,gid=1000,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,showexec,utf8,sync,errors=remount-ro 0 0

UUID=64f281c4-5799-4608-88e2-cea581f515d8 /mnt/backup btrfs noauto,users,compress-force=zstd:3,noatime,exec 0 0

They are all marked noauto and none of them is currently connected.

If I remove or comment all these 3 lines then the slowness disappears!

If I then uncomment only one of them, for example only the last line (this is an USB drive) and save fstab the slowness immediately returns. If I then connect this drive (without mounting it!) then dolphin is fast again.

So the symptom can be described as such:

* If there is a noauto entry in fstab and the device is not currently connected then dolphin exhibits a delay of 500ms on every click during folder navigation.