The theme developer uses the standard C5 Loader Script (in header.php) and suggested posting this here...
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From Google PageSpeed Insights...

Your page has 7 blocking script resources and 7 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.

jquery.js
ccm.base.js
superfish.js
jquery.mousewheel-3.0.4.pack.js
jquery.fancybox-1.3.4.pack.js
functions.js"
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I found the loader in the header.php but I'm not a programmer; don't know how to change load to <async>