Google PageSpeed Insights really isn’t the best tool for the job. As I’ve said before, if you’re using PageSpeed Insights for testing a RapidWeaver website, then you’re doing it all wrong! If you read the documentation you’ll see it’s geared more towards enterprise level websites receiving millions of visits a day.
As I’ve covered in my Wiki, tools like YSlow are far more appropriate to use for RapidWeaver built websites and will return realistic results that any average webmaster can implement. Theme and page type choice in RapidWeaver will also yield significant differences in loading speed.
Another vote for CloudFlare; which will bring noticeable performance, reliability and security gains to any website.