The issue I get is when customers choose the Credit Card Processing (which looks like what Stripe offers). The people enter their card details and click "Order". Then the screen becomes whitish and nothing happens for something like 15 seconds. There's no loading, nothing but a still screen for 15 seconds or so.
This time is way too much for many (if not most) people, who think there's some kind of issue and try either reloading the page or leaving it.
I'm trying to find a solution to that. The easiest way would be to add a note under the credit card form like "Please don't refresh the page while the transaction is processing" and that would do the trick for most people. I could add some code with the Code Snippets plugin, but I don't know which code exactly.
I'm sure I'm not the only one to have this issue, so if someone could bring some help, that would be awesome.