Excellent point and thank you. The site was not rendering/loading at all, even after 20 seconds.
I uninstalled and re-installed Autoptimize. Then, I chose (checked) only basic settings, not advanced settings.
And poof, everything works works fine. I could not replicate the problem.
?? a mystery to me.
Google PageSpeed shows 77/100 with these errors::
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 2 blocking CSS resources. This causes a delay in rendering your page.
These are:
https://b84.5f6.myftpupload.com/wp-content/cache/autoptimize/css/autoptimize_c8bcad0c82948f5a734ea8b2a14c1248.css
and
https://fonts.googleapis.com/….
(And my understanding is that Autoptimize can not optimize fonts).
No errors in inspect element/console.