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Does the 20i CDN perform cache warming?

Yes. The 20i CDN performs cache warming to ensure cached pages are served as frequently as possible, to as many users as possible.

When a user requests a web page a cached copy is stored at the CDN node closest to where they made the request. 

If another user requests the same web page and uses the same CDN node they’ll be served the ‘warmed’ cache generated by the first user, ensuring they get a cache HIT on their first visit.