This feature was added in Caldera Forms 1.5.3
Why Use The Caldera Forms CDN?
When you enable the CDN mode, pages on your site with forms should load faster, especially on sites farther from your server and your server’s overall usage will be lowered. Also, it’s free.
Enable CDN Mode
That’s it. It’s on.
Usage Data Sharing
One of the reasons we chose jsDelivr is that they are actually serving from multiple CDNs, based on end-user location and real time usage data. That real time usage data is partially gathered by a small tracking script that is inserted into the page footer and has no affect on page load time since it is loaded asynchronously. When you enable the Free CDN mode, a small amount of usage data is shared with jsDelivr.
None of that data is shared with us. We felt like if we were going to integrate with this great free service, the best way to pay it forward was to contribute usage data to improve their service.
For more information, and what is shared read this section of their readme.