The tooling provided by Google is extremely frustrating to use -- as a developer on a large content site where we are taking this seriously. I can't believe that they will simply apply your "pagespeed insights" score to your search ranking, they must have much more nuanced scoring mechanisms.

For example, their crawler seems to not understand picture elements at all, and they're penalizing us (6 points) for offering retina options at all (saying that we need to resize the images).