[dolphin] [Bug 442723] New: Dolphin slow to list SMB folder content

[MarcSerra]

https://bugs.kde.org/show_bug.cgi?id=442723

            Bug ID: 442723
           Summary: Dolphin slow to list SMB folder content
           Product: dolphin
           Version: 21.08.0
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: mserra at manxa.net
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 141715
  --> https://bugs.kde.org/attachment.cgi?id=141715&action=edit
tar file containing 3 gifs

When list an SMB shared folder, dolphin needs a lot of time to load the
content.

STEPS TO REPRODUCE
 1. Dolphin information panel disabled
 2. Thumbnails disabled
 3. system settings > credentials filled with a correct SMB username/password
 4. List or refresh an SMB shared folder using Dolphin


OBSERVED RESULT
Take an unacceptable time to load the folder content.

EXPECTED RESULT
Load the folder content quickly.


SOFTWARE/OS VERSIONS
Linux: KDE Neon 5.22
KDE Plasma: 5.22.4
KDE Frameworks Version: 5.84.0
Qt Version: 5.15.3
Kernel: 5.11
Graphical platform: X11

ADDITIONAL INFORMATION

I attach three gif files (in a tar.gz file):
 1. dolphin_43_folders.gif: you can see loading 43 folders, takes 3 segons
 2. dolphin_3000_folders.gif you can see loaging 3000 xml (between 3 and 10KB)
takes a long time (I cut the gif after a few seconds)
 3. konsole.gif: listing a folder using smbclient, lists the content instantly

I Can reproduce under a new user too.

This issue exists on my system for a long time, not only for the specified
versions.

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