[dolphin] [Bug 445606] New: Dolphin ignores 'Skip previews for remote files above: no previews' and is extremely slow when browsing through a shared folder mounted with CIFS

[Patrick Silva]

https://bugs.kde.org/show_bug.cgi?id=445606

            Bug ID: 445606
           Summary: Dolphin ignores 'Skip previews for remote files above:
                    no previews' and is extremely slow when browsing
                    through a shared folder mounted with CIFS
           Product: dolphin
           Version: unspecified
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: bugseforuns at gmx.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY

STEPS TO REPRODUCE
1. make sure 'Skip previews for remote files above' is set to 'no previews' 
in 'Previews' tab of Dolphin settings
2. use CIFS to mount a remote folder containing hundreds of files with preview
(videos and/or images). I run the following command in Konsole:
 sudo mount -t cifs //ip=address/shared_folder /mount/point  -o
workgroup=workgroup,iocharset=utf8,uid=user,gid=group
3. open Dolphin, activate Icons view mode and browse through the shared folder
mounted in the step 2

OBSERVED RESULT
Dolphin unexpectedly generates previews and is extremely slow, it takes ~5
seconds to react to clicks
and scrolling despite normal cpu usage. If I disable 'Show previews' in 'View'
menu and them restart Dolphin,
the problem disappears, Dolphin becomes responsive.

EXPECTED RESULT
Dophin respects 'no previews' settings and is responsive

SOFTWARE/OS VERSIONS
Operating System: KDE neon Unstable Edition
KDE Plasma Version: 5.23.80
KDE Frameworks Version: 5.89.0
Qt Version: 5.15.3
Graphics Platform: Wayland

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