In front of our Content site we have the Cloudflare Content Delivery Network. As part of the CloudFlare community, our web traffic is routed through their intelligent global network. Cloudflare automatically optimize the delivery of our web pages so your visitors get the fastest page load times and best performance. They also block threats and limit abusive bots and crawlers from wasting our bandwidth and server resources. The result: CloudFlare-powered websites see a significant improvement in performance and a decrease in spam and other attacks.
By using Cloudflare we also enabled by default the secure https:// protocol (the new de facto standard for websites).
We are leveraging for the content site publishing the global Web backbone of github.io (via their gh-pages facility).
This allows us good performance and high availability of the content sites.