Thank you for the link and info, I reconfigured my SMB share with these settings, (customizing to my share paths as needed) and I'm sad to report zero difference.
It takes about 5 - 30 seconds just to start copying each file.
I have the same problem with SMB and MacOS. Did you manage to resolve it?
Improving Unraid Performance with Many Small Files
in General Support
Posted
I have the same problem with SMB and MacOS. Did you manage to resolve it?