How Content Delivery Networks Solve the Problem of Physical Distance

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A web application hosted in Virginia may perform flawlessly by all server metrics, yet still feel slow to users in India, Germany, or Brazil due to the sheer physical distance data must travel. A round-trip request between Bengaluru and Virginia can add 200–300 milliseconds of network latency on top of minimal server processing time. When a single page loads dozens of assets, each requiring its own round trip, those delays compound into several seconds of wait time. This is the core problem that Content Delivery Networks (CDNs) address by routing users to geographically closer edge locations, such as Mumbai instead of Virginia. Unlike previous optimizations targeting server workload or database efficiency, CDNs tackle a fundamentally different bottleneck: the speed of light across physical infrastructure.

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