[Bug 1946061] Re: dolphin: 500ms delay when closing tab, folder browsing slowed to a crawl since upgrade to 21.10

[Bernd Kreuss]

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.

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https://bugs.launchpad.net/bugs/1946061

Title:
  dolphin: 500ms delay when closing tab, folder browsing slowed to a
  crawl since upgrade to 21.10

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