Prioritize visible content

Hi

I have installed Agama on a new instance of WordPress and have used the Google Page Speed tester tool https://developers.google.com/speed/pagespeed/insights.

One of the errors is:

Prioritize visible content-

Your page requires additional network round trips to render the above-the-fold content. For best performance, reduce the amount of HTML needed to render above-the-fold content.
The entire HTML response was not sufficient to render the above-the-fold content. This usually indicates that additional resources, loaded after HTML parsing, were required to render above-the-fold content. Prioritize visible content that is needed for rendering above-the-fold by including it directly in the HTML response.
Only about 9% of the final above-the-fold content could be rendered with the full HTML response.

Any tips on how to fix this?