[dolphin] [Bug 442684] New: Dolphin keeps freezing on (slow) remote sshfs (and local) filesystem

[kolorafa]

https://bugs.kde.org/show_bug.cgi?id=442684

            Bug ID: 442684
           Summary: Dolphin keeps freezing on (slow) remote sshfs (and
                    local) filesystem
           Product: dolphin
           Version: 21.08.1
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: kde_org at dlk.pl
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY


STEPS TO REPRODUCE
1. connect to remote fs (sshfs host: folder)
2. open folder in dolphin with preview enabled and tree view (to increase the
effect)
3. open dolphin, and experience 20s interface freeze on every action once
doplhin interacts with remote fs

OBSERVED RESULT
Looks like loading (thumbnails?) keeps freezing whole dolphin
It's very bad experience to wait sometimes over 20s to go back to different
directory or trying to select files to do something with them.

EXPECTED RESULT
never freeze interface, and just load thumbnails and file details slowly

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: plasmashell 5.22.5
(available in About System)
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.85.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
I know that doing async task is hard and prone to problems, but it's very bad 
experience.

Same behavior happen if I have hard drive in sleep state, and I open dolphin.
Dolphin doesn't even show for the whole thime hard drive spinup (i hear it very
clearly as It's external usb drive and it takes at least 7s) and it doesn't
matter if I want to use it, as long as It's mounted and shown in dolphin,
doplhin trying to get drive usage and that is waking up hard drive.

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