I found it awful, on a Raspberry pi 4. Scanning through 2TB of movies on a NAS (gbit nic) took days. No visible indication of progress or where it's stuck. When it's done and there's a load of stuff missing, there's no clear way to find out what it ignored and why, so all you can do it manually go through every movie that it didn't find (easier said than done). I fought with it for 2 weeks and dumped it for Kodi and a direct attached 4tb hdd. Kodi finished the scan super quick and just works.
