[Hummingbird] Google PageSpeed Insights

My client's score on PageSpeed Insights is really poor.

https://developers.google.com/speed/pagespeed/insights/?url=http%3A%2F%2Fnikkiscollarclub.com&tab=desktop

Is there anything more we can do in Hummingbird, or is this just a problem with the theme?

I've compressed images, tried to move all of the JS files to the footer and done other things, but the score is still crap in mobile view. (Desktop is not too bad.)

Suggestions?