Can I shorten the user waiting time for payment transition?

Related articles

• Is the redirect from the payment screen of Web Payment conducted only when a payment succeeds?
• How can I determine the success or failure of payment?
• After the user pays, the payment fails because it is not redirected to the merchant.Is redirection guaranteed?
• Is there any way to undisplay the login form on the payment screen?
• Tell me the recommended flow of Web Payment including abnormal case.