The zoo has a single webpage which some of it works and some of it does not dependent upon the browser.
pagespeed (my blog) a googlle thing likes things adjusted with async and defer html 5 keywords (my blog) add http/2 secure and unsecured methods* and you have a party.of which i was designated to solve
So one day i decide to fix this one page weirdo – removing those two words from jQuery and boom the page does what it used to do every time in most browsers.
Should you trust pagespeed – no, but i it seems the move to http2 is one that needs some thinking on with simple html.
I was kind of amazed i was that simple and that http2 conflicts with pagespeed but not too surprised after all what google wants and we want are two different things.