It's faster, but still incredulously slow. For example, when you launch it it's just a black rectangle for 3-5 seconds (2018 Macbook Pro). And the UX is all over the place, with 3-4 different ways to go back/close whatever you're looking at. The way you navigate reviews with side-swipes might sense on a phone but makes no sense whatsoever on the Mac.

You can tell it's made to spec and with zero developer love softening the rough corners, because no developer who cares would make a full-screen screenshot view mode you cannot exit with Esc.