Mobile prototype doesn't open in Safari but works in Chrome

I’m planning to use my Figma prototype for remote user testing. The issue I have is that the share-link to the prototype takes forever to load in Safari on iPhone. However in Chrome on iPhone it loads in a reasonable amount of time. I’ve tried everything possible to shorten the load time, e.g. flattening and ungrouping everything, detaching all components, compressing images etc, but the problem is still here. I even tried making a design with just a single text field in it, and even this takes forever to load! This makes it more or less impossible to use Figma prototypes for remote testing.