In their KB article announcing and describing their new offering they suggest that websites will experience dramatic improvements in performance:
Put simply, using a CDN is like having a mini-server near any of your site visitors to help load and run your website faster and more efficiently for them, even for visitors from the other side of the world.
For example, let’s say that you’re a nature photography blogger based in Montana, and your website is hosted with WPX in our Chicago datacentre.
That site will load well across North America but nature-lovers visiting your blog from Australia, Europe, Asia, and Africa will find that your website is slower to load for them.
This is because your blog’s content (images and text mainly) is being retrieved from one of our Chicago servers and sent all the way across the world to visitors outside the USA.
Instead, our CDN has already copied your popular content to servers around the world to benefit your far-away site visitors.
So whether your visitors are from Berlin, Sydney, Johannesburg, or Tokyo, they’ll see your blog content from a fast local server and not from the other side of the world.
Using our Cloud CDN, the speed increase for site visitors around the world is dramatic.
Making the point that unlike third party CDNs available they are able to optimise for WordPress and continually test and tweak their product.
The CDN will be available to all customers for free, but those how have signed up for a plan before 24 October 2018 will need to turn it on manually, ensuring that their domains are pointing to WPX’ Hosting’s nameservers.