>I'd prefer to just improve the browsers instead of putting the burden on Web authors.
A cynical answer is that Google released this because web authors haven't done a good enough job making fast pages.
Sure, I agree that many of the optimizations suggested are good practice.
(Note, though, that serving 2000px wide images to iPhones is fixable in the browser, with downscale on decode.) :)
> A cynical answer is that Google released this because web authors haven't done a good enough job making fast pages.
It's not cynical—that's the exact motivation of AMP. My point is that it cuts both ways: we need to keep improving the browser, as there are still massive opportunities for performance improvements.
From a rendering perspective, yes. From a "make this page load faster", no, because the network download time is 10x-100x larger than the processing time.