It cannot be that, surely since the page prior to the CTA actually shows the shirt with the string composited. So is it perhaps doing some live pricing based on a collection of vendors on the backend? Better to show an initial price and then a progress bar that moves up as the vendors return prices I think. Either way, I reflexively almost clicked away as soon as the 20 s started.
Damn, ok. Good feedback. I heard that from someone else, too. Our attention spans are fried, lol. Can't wait 20 seconds for a shirt preview! It's true though. So the first "preview" is just rendering text on top of a blank shirt mockup, and the the second one (after you click and go to /preview) actually sends the text to the Printful API to get a render of how the shirt will actually appear. That's the delay, waiting for the final image to come back from Printful.