Library synchronizing is slow or hanging

Hello. I recently moved into a new home, so I took my audio system down and then brought it back up again a couple of months later. Somewhere in rebuilding, I upgraded Audirvana and my MacOS to Catalina. I’m not sure if that’s relevant, but both versions are current.

My issue is that my library has been synchronizing for two days. I keep my music in a monitored share on a Synology DS3018 NAS wired via ethernet to my iMac running Audirvana. Does anyone know how to troubleshoot this issue?