I see the performance stuff as the most useful. Otherwise, the general layout/responsive design pointers are pretty much common knowledge at this point (or so I think).
Great starting point, would be nice to integrate with Pagespeed.
Great starting point, would be nice to integrate with Pagespeed.
Edit: there is also information that is common knowledge for a lot of advanced developers but for the rest of developers there are not many places that present a similar narrative.