Multiple CDNs Needed for Global Content Delivery
Cedexis Radar data reveals that CDN performance varies significantly between end-user ISPs, and these performance differentials change continuously throughout the day. CDN platforms are not everywhere. Economic, political and business constraints are all factors in where, how, and when they build their networks.
Even the largest CDNs only peer or have servers directly in a subset of the 34,000+ ISPs in the world. For those networks that are not directly peered with the CDNs, end users must transit across other networks to get access to CDN servers. Every day these routes change as BGP and peering arrangements are modified. Fiber cuts or outages occur, leading to unintended congestion and outages.
The use of real-time load balancing between multiple CDNs optimizes availability, latency and throughput, by routing traffic to the best-performing content source, moment by moment.
See the Radar performance reports.