Registration takes long for completing

Can someone help me in a direction to find out the issue with the registration app.
When a customer is registering it takes almost 1 minute to complete and login the customer.
Other actions in Nextcloud goes fast.

I am using NGINX 10.1 and nextcloud 12.03
Registration app is 0.3.1

what server are you using? sometime this could be some caching issue. or your database performance.