While of course I want latency to be as low as possible, the difference between 100ms and 500ms of latency doesn't register in the engagement metrics for these experiences. For millions of laypeople, it doesn't seem to matter that much. However, going from 670ms of time to first image (this service) and 2.5s (worst case) increases bounce rates by as much as 5 percentage points. PureWeb, which typically takes 35s to load, isn't suitable for any mass audience at all.

So imagine downloading a USDZ file for some AR thing. It's real, it's something people try to do. But the bounce rates on those experiences are insane, I don't know why Niantic funds them, there isn't anything you can do about it. There isn't a future for "it takes a while to load" on phones. That's the real constraint.