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What is a Content Delivery Network (CDN)?
A content delivery network (CDN) is a group of servers spread across many cities that keeps copies of your site’s files and serves them from whichever location is closest to the visitor. Your site still lives on one main server, the origin. The CDN sits in front of it and answers whatever it can on its behalf.
Say your store is hosted in Amsterdam and someone in Dallas opens it. Without a CDN, every image, script and font crosses the Atlantic, and so does each round trip the browser makes before the first byte shows up. With one, most of that traffic stops at a server in Texas. Those individual machines are called edge servers, and the CDN is the whole network of them, plus the rules that decide what gets cached, for how long, and when to go back to the origin.
Most CDNs do more than cache, too. They handle the HTTPS connection near the visitor, compress images on the fly and filter out bots before they reach your server. Cloudflare, Fastly and Akamai are the big names, and hosted platforms usually bundle one in, so plenty of stores run on a CDN they never set up.
What this means for revenue
Speed is the obvious part. Shorter trips mean a faster Time to First Byte and a head start on Largest Contentful Paint, so fewer people bounce off the landing page you paid to send them to.
Then there’s load. On Black Friday, or the afternoon a creator’s video suddenly sends you a wave of visitors, the CDN soaks up requests for files it already has, so your origin isn’t serving the same hero image ten thousand times. Without that cushion it slows down for everyone. Checkout included.
Having a CDN and getting much out of it are two different things, though. Default setups often cache images and scripts but still send the HTML page back to the origin on every visit, and that’s the file the browser waits on before anything else can start. Fixing cache rules is usually cheaper than a bigger hosting plan.
How Uxify helps
Reality tracks TTFB and LCP from real visitors and splits them by country, device and network speed, so you can see whether distant shoppers actually get the speed your CDN promises. Its TTFB breakdown separates DNS, connection, TLS and server time, which tells you if the wait comes from distance or from requests falling through to the origin. Ask Uxi can read those numbers with you and suggest what to change first. And since one careless cache rule can quietly undo months of tuning, Vita watches your Core Web Vitals and flags the regression when it lands.
Content Delivery Network (CDN) FAQs
Does my online store need a CDN?
If you sell outside one region, yes. On a hosted platform you probably have one already, so the real question is how well it’s set up. A store selling locally from a nearby server gains less speed, but still gets the spike protection.
What’s the difference between a CDN and an edge server?
The CDN is the network. Edge servers are the machines inside it that answer requests, and our edge server entry shows how to check whether yours are getting cache hits.
Why is my site still slow with a CDN?
Usually the pages themselves aren’t coming from it. Uncached HTML, cache lifetimes of a few seconds, cookies that make the CDN skip the cache and ad tracking parameters tacked onto the URL can all send requests back to the origin, since many CDNs treat each unique URL as a separate page. Our LCP optimization guide covers the setup side.