How CDN Works and Do You Need This Technology?

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The faster your site works, the higher its position in search results and the more loyal users are to you. Agree, you are unlikely to decide to buy something in an online store if you have to wait even 5-10 seconds for web pages to load?

The speed of online resources is influenced by many factors, including the distance of the end user of the site from the source server, the degree of optimization of web resources and the volume of “heavy” content placed on it - audio and video files.

To make websites open in a second for any user, CDN services are used. Let's figure out how they wordpress web design agency help even highly loaded websites and web applications work faster.

CDN: How it works in simple terms




Content Delivery Network is a geographically distributed content delivery network consisting of hundreds of caching servers. Let's see what it does.

To put it simply, the operation of a website on a regular server or hosting is arranged as follows:

the user's browser requests content from the source server where the data is hosted;
the server processes the incoming request and sends data to the client;
the site is opening.
Scheme of work without CDN
No CDN

CDN workflow
After connecting CDN

CDN adds a whole network of servers to this algorithm that cache (i.e. store) the content of the source server. Due to the fact that the Content Delivery Network infrastructure is distributed geographically (usually even on several continents), the site pages are instantly loaded by visitors from anywhere in the world. Let's figure out why web resource owners connect CDN.


Advantages of CDN

Increase web page loading speed
Let's assume that your site is hosted in one of Moscow's data centers. At the same time, the project has a fairly wide audience and your resource is visited not only by residents of Russia and the CIS, but also, for example, the USA. Residents of the central regions will receive content at a good speed. Visitors from Kamchatka and the Far East will have to wait a little. But those who are on another continent will have to put up with the fact that each page loads in 5-10-15 seconds!

Connecting a content delivery network allows users from all over the world to receive your site's content at the same good speed. CDN servers will constantly cache the resource's content, and visitors will automatically connect not to a distant source server, but to the nearest cache server.

Reducing the load on the source server
On any modern website there are two types of content:

static - something that doesn’t change: texts, pictures, videos, etc.;
dynamic - data that is generated when a request is received or substituted from a database: user history, history, recommendations, etc.
Static and dynamic content create different loads on the server. If the loading speed of dynamic content depends primarily on the available amount of RAM, then the loading time of static content depends on the Internet speed.