Unlike the competition, jsDelivr uses a unique Multi-CDN infrastructure built on top of CDN networks provided by Cloudflare, Fastly, Bunny, and GCore. Additionally, we use custom servers in locations where CDNs have little or no presence.
Our smart load balancing system ensures the best possible uptime and the best possible performance. Each time a user downloads a file from jsDelivr, our algorithm figures out the optimal provider for that particular user and that particular time based on the performance and availability data for the last few minutes. All that happens within a few milliseconds.
This algorithm also immediately responds to performance degradation. For example, if a CDN provider gets DDoSed in Europe and their response times increase, jsDelivr will notice the change and simply stop using this provider in Europe but still consider it for users in other locations.