[dolphin] [Bug 420481] New: Dolphin hangs on leaving (!) big directories on a network share

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=420481

            Bug ID: 420481
           Summary: Dolphin hangs on leaving (!) big directories on a
                    network share
           Product: dolphin
           Version: 19.12.3
          Platform: Kubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: panels: folders
          Assignee: dolphin-bugs-null at kde.org
          Reporter: virusmater at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
I have a cifs mounted directory  (/mnt/share) with 700+ sub directories
(/mnt/share/sub1,  /mnt/share/sub2 etc) with only few files under. Going inside
of that directory (/mnt/share) happens immediately, but clicking on the sub
directory takes 3-4 seconds. Also going from /mnt/share to /mnt also takes the
same amount of the time. So exiting directory hangs, but entering it happens
quick.

STEPS TO REPRODUCE
1. Mount cifs share with 700+ subfolders
sudo mount -t cifs //192.168.1.20/share/ /mnt/share -o
username=user,password="pass",workgroup=workgroup,iocharset=utf8,uid=1000,gid=1000
2. Go inside of /mnt/share - it happens immediately
3. Enter any subfolder or click mnt /mnt - dolphin hangs for 3-4 seconds

OBSERVED RESULT
Dolphin hangs for 3-4 seconds

EXPECTED RESULT
Dolphin opens sub directory immediately

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 20.04

KDE Plasma Version: 5.18.4
KDE Frameworks Version: 5.68.0
Qt Version: 5.12.8

Also tried with most current development version of KDE Neon Live CD - the same
result

ADDITIONAL INFORMATION
Previews are disabled, columns with size and recent edit are hidden.
In konsole everything works quick - cd works immediately. Thunar also works
fast.

I would understand a slowdown on enter a directory, but on leave?

I tried to include logs, but there is no dbg version of Dolphin, so the
instruction on wiki didn't work. Tried to run it with dbg, but Dolphin forked
out and --no-fork parameter doesn't exist anymore.

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