Hansson Appliance - Mounting external storage (local SMB 3 Share) dramatically slows down NextCloud GUI

Hi all,

I experience a strange issue with my new NextCloud appliance.
I imported the VM in my Synology Virtual Manager and ran through the startup script.
The problem afterwards is that NextCloud takes about a minute until the website shows up after clicking something. When I remove the external storage mount in NextCloud -> everything is fine again.
As soon as I add the external storage -> everything is SO slow…

Any ideas how to troubleshoot?

Many thanks!