AMP pages aren’t fast because of the AMP format. AMP pages are fast when you visit one via Google search …because of Google’s monopoly on preloading:
Technically, a clever trick. It’s hard to argue with that. Yet I consider it cheating and anti competitive behavior.
Preloading is exclusive to AMP. Google does not preload non-AMP pages. If Google would have a genuine interest in speeding up the whole web on mobile, it could simply preload resources of non-AMP pages as well. Not doing this is a strong hint that another agenda is at work, to say the least.