For consistency, server hardware is largely the same across server groups. The main difference between different server groups is the bandwidth cost charged by our vendors (ISPs). A PoP in the “ultra” group is more expensive than one in the “standard” group, but does not necessarily deliver better performance than a “standard” PoP. Performance experienced by each end user is determined by the connectivity between the user and the PoP. Adding the “ultra” group to serve a region just provides our GSLB algorithm more PoPs to choose from, such that the end users in that region are more likely to get a PoP with better connectivity.

No. The CDN Pro GSLB assigns PoPs primarily based on performance. Adding “ultra” to serve a region enables the GSLB to choose from a larger pool of PoPs for that region. If the algorithm determines that a request will be better served by a “standard” PoP, the traffic is still served from that PoP and incurs a “standard” charge.

In general, the “Standard” group delivers excellent coverage for North America , Europe, and some regions in Asia. Adding the “Premium” group can enhance the performance in those areas as well as the Middle East. Adding “Deluxe” delivers good performance in APAC countries. Adding “Ultra” gives you our best possible performance in all areas including South America, Oceania and Africa. We invite you to try different configurations to determine the right balance between performance and cost.

CDN Pro does not charge for TLS certificates and HTTPS accesses. You can BYO certificate for your property domain configuration. CDN Pro also supports self-signed certificates and auto-renew through Let’s Encrypt.

CDN Pro collects CPU usage based on NGINX’s “event-driven, non-blocking” architecture and calculates the total CPU time consumed to handle a request. For more technical details about the process of collecting CPU time, refer to this blog.

To determine the amount of CPU resources required to deliver a fixed amount of data, divide the total CPU time by the traffic volume. Based on our measurements of a set of domains containing different content, a domain with highly cacheable large file content can take as little as 1.56 seconds to transfer 1GB of data, while a domain with dynamic API service content can take 453.66 seconds. The results show significant differences in CPU time by domains serving different types of content.

Based on the per-CPU hour price of $1.95, the cost of CPU consumption for the above 1GB data transfer can be calculated as follows:

For highly cacheable large file content: (1.56s/3600) * 1.95 * 100 = 0.0845 cents.
For dynamic API service content: (453.66s/3600) * 1.95 * 100 = 24.57 cents.