More in depth, but plain English summary from the researchers here:
https://theconversation.com/amp/evidence-of-brand-new-physic...
https://theconversation.com/amp/evidence-of-brand-new-physic...
The non AMP page is 1.4MB and 45 requests, the AMP page is 400KB and 16 requests - normally this means AMP just blows everything out of the water (despite HN hate). Something is messed up here that AMP is so poor, initial server response is terrible.