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Sites are distributed via the Cloudflare CDN which means that normally the closest server with cached content for your site is provided, in your case you are using Smart Tiered Cache. To summarize, Smart Tiered Cache ensures that all requests for cache flow through a single upper tier cache location which increases cache HIT percentages, and reduces requests to the origin server, however it can result in higher latencies fulfilling those requests since the upper tier could be located far away from the lower tier that originated the request.