504 Gateway TimeOut

Hey, when a person signs up to the membership the payment is taken but the page is very slow then it goes to a 504 gateway timeout page.

I’m not sure how to fix this, but we are launching soon and would love some help or advice. PHP settings are all high, but it still doesn’t work.

We’re using stripe for this ??

We get a confirmation email, and the payment goes through but as I say it goes through to the 504 gateway timeout page.

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