I have checked that you already pointed the domain to our server, great work!
Have an outstanding day
You have a big website.
Your website used lots of images which delaying the loading speed.
You need to have a very good optimization skill and deploy WP plugins to speed up the loading speed.
This is a fixed PHP script and cannot be modified in considering thousands domain hosted on the server.
If you need a better speed, I can swap or convert to this: https://www.seocheckout.com/shared-webhosting/582110/-The-US-Phoenix-Shared-Hosting-Server-With-Free-SSL-Certificates