I tried opening sites with AMP, and some of them didn't even load. 1000/300 AC 5ghz wifi. What is page speed when sites don't load? My guess is even on 2G that'

I tried opening sites with AMP, and some of them didn't even load. 1000/300 AC 5ghz wifi. What is page speed when sites don't load? My guess is even on 2G that's not an added bonus..