One of the reasons I subscribed to WPMUDEV was an article I read about above the fold resources slowing page-loads and how to minify, defer or async load said resources... I saw hummingbirds granular control and really thought that took the prize.
I am having a little difficulty though. In the minification settings on my site, when I try to save an adjustment, my page starts to reload but I get an ERR_EMPTY_RESPONSE, a blank page load and when I reload the page the settings haven't taken.
I have granted access to support, I really hope you can find my problem and help me sort this out.