https://bugs.kde.org/show_bug.cgi?id=445609

            Bug ID: 445609
           Summary: Navigating rclone mounts too slow with KDE file
                    picker, but very fast on Dolphin
           Product: frameworks-kio
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Open/save dialogs
          Assignee: kio-bugs-n...@kde.org
          Reporter: rafael.palma.l...@gmail.com
                CC: kdelibs-b...@kde.org
  Target Milestone: ---

SUMMARY
I have some rclone mounts on my system for my OneDrive accounts (personal,
business, etc). They're all working fine and when I navigate them using
Dolphin, they're very responsive. Opening folders with many items usually takes
less than a second to load using Dolphin.

However, when I'm on an application (f.i. Kate, LibreOffice, etc) and I use the
File Picker to navigate the rclone mounts and choose a place to save the file,
the navigation happens very slowly. Even for folders with few items, it takes
about 10 seconds to load. Folders with many items take 30 seconds.

I don't know exactly the problem, but it seems the file picker is caching
recursively the entire folder contents, whereas Dolphin only loads the current
folder contents.

STEPS TO REPRODUCE
1. Create a rclone mout
2. Navigate it on Dolphin
3. Navigate the same mount with the file picker

OBSERVED RESULT
On Dolphin everything is snappy... using the file picker on the same mount is
very slow.

EXPECTED RESULT
Both should have the same speed.

SOFTWARE/OS VERSIONS
Operating System: Kubuntu 21.10
KDE Plasma Version: 5.23.3
KDE Frameworks Version: 5.88.0
Qt Version: 5.15.2
Kernel Version: 5.11.0-38-generic (64-bit)
Graphics Platform: X11
Processors: 12 × Intel® Core™ i7-10750H CPU @ 2.60GHz
Memory: 15,5 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics

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