Ajax Loading Slow in Wordpress

Hi,
I have a Wordpress plugin called SupportCandy that uses admin-ajax.php
The plugin allows to create a support ticket, reply to it, edit it, delete it
Every Ticket Reply, Ticket Create it takes around 60 seconds to load the query.
Other calls like delete ticket, edit ticket work fast without issues.
I need help in diagnosing what is causing the issue and fixing it.

Note - I cannot give access to Wp-Admin.

If you can work by guiding me without the site URL I will pay extra 50% in a tip.

Any reply without one of these lines:
"I can guide you to fix this without site URL" <--- Extra 50% to your offer

Or:

" I can help you without wp-admin but need site URL"

Any reply without one of these lines will be ignored.