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How does Netflix stream videos worldwide in milliseconds,,, while some sites take “seconds” to load a basic HTML page?
The answer is proximity…
i.e., closeness between the servers and end-users.
Imagine a single server to handle global traffic:
International users wait 300ms+ just for the first byte from the “distant” server
Origin server1 handles all requests from every continent
One traffic spike could take down the entire site
Onward.
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Here’s what you’ll find inside this newsletter:
Why websites slow down. The hidden costs of distance, overloaded servers, and bandwidth limits.
Why CDNs became essential. How they evolved from a niche scaling solution into core internet infrastructure.
What happens when you visit a site. The journey your request takes before content reaches your browser.
The building blocks of a CDN. Edge servers, origin servers, DNS, Anycast, GSLB, and the components behind global content delivery.
Where CDNs make the massive impact. The industries and applications that depend on them every day.
Why CDNs aren’t a silver bullet. The trade-offs, limitations, and operational challenges every engineer should understand.
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