Why Your Content Travels Faster Than Light: The Hidden Architecture of Content Delivery Networks
In 2006, Amazon discovered something that would reshape how the industry thinks about performance: every 100 milliseconds of latency cost them 1% in sales. That same year, Google found that adding just 500 milliseconds of delay to search results caused a 20% drop in traffic. These weren’t hypothetical concerns—they were measured impacts on real revenue. The physics of the internet imposes hard constraints. Light travels through fiber optic cable at roughly two-thirds its speed in vacuum—approximately 200,000 kilometers per second. A round trip from New York to Singapore covers about 30,000 kilometers of fiber, which means a theoretical minimum latency of 150 milliseconds just for light to make the journey. Add network equipment, routing hops, and protocol overhead, and real-world latency easily exceeds 200 milliseconds. ...