It's worth pointing out, though, that the source of a lot of this performance drain is ads. And Google are the main provider of ads across the internet.
To me, AMP feels like a method for Google to sidestep the real issue at hand.
Are google ads that slow? When I look at the dozens of requests issued by slow sites, I don't see google domains. I see every other fucking tracker, suggester, sharer, and optimizer, but not google.
Ah, but just because you see Google ads, it doesn't mean that was all the website tried to serve.
They probably ran a waterfall, asking AppNexus, Pubmatic, TradeDesk and 40 other ad providers for an ad at $5, $2, $1, etc. before giving up and serving a Google ad...
Google doesn't force you to add ads to your site, though. It's disingenuous to suggest that it's the ad provider's fault that you wanted ads on your site.
To me, AMP feels like a method for Google to sidestep the real issue at hand.