Secrets to Lightning Fast Mobile Design

I hate being that guy, but this presentation has been linked to so many times in the past couple weeks, usually with different titles. There was a giant discussion just yesterday, focusing on the slide that talks about uploading photos right after the user takes them for smoother UX.

Just check for duplicates a little more carefully, please?

Particularly interesting: slides 82-85 : The goal is a solution that feels fast to the user, and that goal ought to trump engineering considerations (eg: minimize number of round-trips) by default.