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There are two issues and the sample code has a section for each (preceded by a comment header) Part 1 of the code is getting listings. That seems to be slower on 6.8.0 for all directories and is noticeable to a human on a single call without concurrency starting with a couple thousand files. Part 2 of the sample code is only calling stat. I can only reproduce this issue for very large directories, but maybe that's because it requires large directories to produce a measurable difference.

I never call a directory listing in that directory. I only open specific files by naming convention. So, adding subdirs would make things more inefficient because I would have to check for a file in each subdir. My current setup works very fast using a normal Samba server eg 6.7.2 or Ubuntu. The first issue is a problem for much smaller directories (a few thousand).

No but Samba team changes defaults all the time from release-to-release (kinda maddening they do this). Please type this command running 6.7.2: testparm -sv > /boot/smb672.txt and then boot 6.8-rc8 and type: testparm -sv > /boot/smb680.txt You now have those two text files on your flash which you can post here. Note: those files will contain your share names, if you don't want to post here then send to me via PM. Also would be helpful to describe to me how to reproduce this issue.