fyi, you may already be aware of this but your CDN is returning 502 Bad Gateway error messages instead of you site’s images and scripts which is basically breaking your site. You might want to address that ASAP. fyi, this was already happening when I logged on to start at the issue I originally contacted you about. In other words, I did nothing to cause the error.
As for the original issue, I narrowed down the cause you should noticed a significant reduction in your admin page load times. Basically every page load was causing 50 external HTTP requests to various site which was causing an admin page load time of nearly 60secs. I’m still investigating and I’ll give more details as I know more.