The CDN is a helpful tool to make your website fast, but there are other tools that we have built into our templating engine that can also improve page load performance. The most notable is the ability to easily load scripts asychronously and defer their execution to prevent parser blocking. It's actually much simpler than it sounds, you just have to be careful how you use it.
Just be careful how you use this - if another script relies on functionality in this script you may not be able to take advantage of async and deferred scripts without experiencing some odd bugs. Also, if the same script is included multiple times with different options you could see unexpected behavior.