Haven't tried this myself but came across this interesting AMP workaround: https://www.goinflow.com/amp-mobile-pagespeed-score/
> From a peak of 1.9% conversion rate at around 2 seconds
This sentence and the graph it accompanies seems to imply that if your site is too fast it could reduce your conversion rate. What's going on here?
Well, at the bottom of the article that graph came from:
> What about all those fast pages with low conversion rates and high bounce rates?
> Good question. Faster pages should retain and convert more visitors, right? In general, yes, but some of the speediest pages on a site are 404/error pages, hence the poorer business metrics.
It seems like you'd want to control for this, to get statistics on bounce rates only for pages that wouldn't otherwise bounce the user anyway.
Still not entirely convinced what's supposed to work about this method.