New site created with Upfront has has 22 blocking script resources and 17 blocking CSS re

I noticed that the basic layout seems to load, and then the style takes effect. It usually just takes a fraction of a second, but it's noticeable.

So I ran WP-Checkup, and got this:

Your page has 22 blocking script resources and 17 blocking CSS resources. This causes a delay in rendering your page.
None of the above-the-fold content on your page could be rendered without waiting for the following resources to load. Try to defer or asynchronously load blocking resources, or inline the critical portions of those resources directly in the HTML.

I'm a little surprised - the site was designed with Upfront from the start, and I assumed these things would have been part of the design.

Do I need to install Hummingbird on Upfront sites to accomplish this?

Thanks for your help!
Steve