How it works
Images, scripts, styles and sometimes whole pages are cached on the CDN's servers. When someone visits, the nearest server delivers the files, which cuts the distance data travels and speeds up loading.
Other benefits
Because traffic is spread across many servers, a CDN can handle sudden spikes better than a single host. Many CDNs also help block attacks and bad bots before they reach your site.
Common providers
Cloudflare, Fastly, Akamai and Amazon CloudFront are well-known CDNs. Many website platforms and hosts include a CDN automatically, so you may already be using one.
Why CDN matters
Page speed affects both visitors and search rankings. A CDN is one of the simplest ways to make a site load faster for people in different places, which supports Core Web Vitals, lowers bounce rates and keeps the site steady during busy periods.
Faster pages without a redesign
An online store served large product photos from one server, so shoppers far away waited for pages to load. Turning on a CDN and serving images from nearby servers cut load times noticeably without changing the design.
Common mistakes
Assuming a CDN fixes everything
A CDN speeds up delivery, but huge images and heavy scripts still slow pages. Optimize files too.
Caching the wrong things
Pages that change per user, like carts or logged-in areas, need careful cache rules so people don't see stale or wrong content.
Forgetting to clear the cache
After updates, old cached versions can linger. Know how to purge the cache when you change content.
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