Checkout page issue with order

Hey Support.
I’m facing an issue with the checkout page order loading. Mean, when someone places the order. It’s taking too much time for order completion.

Kindly see that short LOOM for more info (https://www.loom.com/share/c48858af21af4eccb1c885f2b63815ac)

Looking forward.

The page I need help with: [log in to see the link]