[dolphin] [Bug 420168] New: Browsing SSHFS folders slows down Dolphin user interface

[Germano Massullo]

https://bugs.kde.org/show_bug.cgi?id=420168

            Bug ID: 420168
           Summary: Browsing SSHFS folders slows down Dolphin user
                    interface
           Product: dolphin
           Version: 19.12.1
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: germano.massullo at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

If you browse a SSHFS folder[1], for example /tmp/folder in this case, and go
into a crowded subfolder like /tmp/folder/foo, Dolphin will slow down a lot the
user interface, till being totally unresponsive for some seconds:
- when in detailed view, I noticed that Dolphin takes seems to be working on
populating the "size" column, with the number of elements in each subfolder of
/tmp/folder/foo
I assume it is working on size column because I can see Dolphin populating the
size entry one by one;
- when in compact view I open a folder, Dolphin seems to be working on
detecting what is the type of the files, because as soon I get inside I see the
files with a "?" (question mark) icon, then Dolphin assigns the correct icon.
For example if a file is a text, assign a text icon, etc.
Note:
- I disabled thumbnail preview in Dolphin;
- I am experiencing this problem also when running in a LAN, so it cannot be a
bandwidth problem;
- Dolphin CPU usage seems to not grow when the slowness quirk is happening

[1]:
mounted for example with command
sshfs -o cache=yes -o kernel_cache -o compression=no
user at 192.168.1.40:/zpool_1/foo /tmp/folder
or with a more simpler command
sshfs user at 192.168.1.40:/zpool_1/foo /tmp/folder

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