I am curious how you are measuring that you 'outperform' a major CDN? Average response time from your local connection? From an arbitrary IP somewhere in the world? An aggregated average response time from many places around the world?
Basically measuring time to first byte (TTFB) (and indeed visually complete etc) as a reasonable correlate of perceived performance, for a simple site over http from my RPi vs via CloudFlare fully cached http and https. The most direct comparison is of a separate fossil site, but other measuring tools show (generally) my RPi http beats or matches CDN http beats CDN https (with HTTP/2 etc) for a UK visitor.
Tests are made from WebpageTest and StatusCake in the main, both from their test points in the UK in various data centers. These sites of mine are UK focussed, not global, so the UK test points are representative, I believe, and should be advantageous to the CDN since it is terminated closer and faster to the client than I can be, from by kitchen cupboard!
not surprising imho - you probably have more 'dedicated hardware' (in an abstract sense) per request than a busy CDN.. if the site software is all cached in ram and cores are free, you're pretty much running 'wide open' on each request..
Though still, the CDN folks have faster machines not running in power-saving mode, and lower latency into the core UK Internet peering points / LINX, and my RPi is doing other things too, such as running a substantial Java-based server.
One fabless SoC maker called Baikal claim that they can saturate 10gbs link with an 8 core arm chip running under 5W (phy power not counted in) for as long as users are using userspace driven network and hardware offloading
DPDK is typically benchmarked in packets per second instead of bitrate. The reason being that 64-byte packets at 10Gbps is much harder than 512+. Also, it depends on what the work is. You can do several hundred Gbps on a moderate Xeon, provided you're just dropping all the packets as they come in.
(Though I've been optimising my tiny low-traffic site on a solar-powered RPi 2 to apparently outperform a major CDN, at least on POHTTP...)