[digikam] [Bug 479711] New: Find new items at startup very slow (Mac)

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https://bugs.kde.org/show_bug.cgi?id=479711

            Bug ID: 479711
           Summary: Find new items at startup very slow (Mac)
    Classification: Applications
           Product: digikam
           Version: 8.3.0
          Platform: macOS (DMG)
                OS: macOS
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Database-Albums
          Assignee: digikam-bugs-null at kde.org
          Reporter: atoms at electropositive.net
  Target Milestone: ---

SUMMARY
***
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***
Further to this bug here: https://bugs.kde.org/show_bug.cgi?id=478674 scanning
for new files on Mac is still abominably slow.  Digikam is effectively
completely unusable in this state.  I'm talking multiple hours for a single
'fast' scan on either the NAS or the locally connected HDD.  SSD seems to be
OK, but I don't have many files on that.  I have a large library of 90k images
I've taken over the years.  I've come from various commercial software
(Lightroom, Exposure etc) none of them seem to exhibit this problem though
Exposure without having a catalog is slowish to load the previews, but even
that is not this slow.

I have the good fortune of being able to test SSD, external HDD and NAS
alongside Windows, Mac and Linux and I haven't so far been able to find
anything the performs well except local SSD.  The Linux client I have skipped
for now based on the other bug needing Digikam 8.3 and no 8.3 version is easily
available for OpenSuse.  I could try another bistro, but I may be better to
downgrade everything to 8.1 and try again.

I am at a loss to understand what is causing this, I've turned scan for new
files at startup off as it's completely pointless at present and I did have the
fast scan option turned on.

STEPS TO REPRODUCE
1. Open Digikam
2. Wait for hours for scan to finish finding new files
3. Check 

OBSERVED RESULT
Many hours to scan

EXPECTED RESULT
seconds if not minutes to scan

SOFTWARE/OS VERSIONS
macOS:  Sonoma, Windows 10 (can try linux)

ADDITIONAL INFORMATION
My main library is on a ZFS pool on a NAS connected via a 1G cable connection. 
Mac never seems to be quite as fast so I've also tried connecting digikam via
windows.  I simply can't buy disks big enough and reliable enough to not use a
NAS.  Some of the library does include some large 300M tiff files, though even
if I isolate those, the problem still persists.

I have copied a portion to an external drive to see if that would speed it up,
but it doesn't.  

I read somewhere that I can turn on some kind of debugging mode and provide
logs, but I can't seem to find how yet, that might be the best place to start?

Thanks.

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