Speaking of AMP and ads, fun fact! If you block ads, AMP purposely ads a few second delay to load all AMP pages. So in your scenario, the winning option is to install an ad blocker and avoid all AMP pages. :)
My own experience with load times as a user who blocks tons of scripts, and countless people citing it over the years. I've responded to them a bunch on HN, but here is one from 2018.
And this is not a swipe. This really does need a citation. It's believable, but only just.