How does CDN work?

CDN (Content Delivery Network) is a service that provides caching of static content to help relieve the original server on which the data is located. The CDN is decentralized and is composed of many pops that are closer to the user, reducing latency and speeding up site loading. For example, if a user from Europe accesses a website located in the US, the latency is up to 150ms at the best (based on the speed of light). As a rule, accessing a page downloads multiple images and data and it may take several seconds for the website to load.

CDN also makes sense for local internet projects by relieving the original server and helping with the load associated with the peak in traffic. Caching of the static content with CDN is advantageous since up to 90% of the web loading time is just loading static content, especially pictures and photos.

The user can affect caching time by setting the http header on their server.

WORLD NETWORK of CDN

MAIN
SERVER
CDN
NODE
FINAL
user

EXAMPLE CASE

The Biathlonmania.com sports project with a number of thousands of requests a second, had a loading time in Europe of 1.5 - 3 seconds, in the US 5 - 8 seconds. Thanks to VSHosting CDN, acceleration has taken place, and in Europe the website is now being downloaded in 1 - 2 seconds and in the US within 3 seconds.
biatlonWITHOUT CDN
EUROPE1,5-3 s
USA5-8 s
biatlonWITH VSHOSTING CDN
EUROPE1-2 s
USAUp to 3 s

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