What Is a CDN and Does Your Website Need One?

A CDN — Content Delivery Network — is a geographically distributed network of servers that stores cached copies of your website's files and delivers them to visitors from a server physically close to them. Instead of every visitor in the UK loading your website from a single server that might be hosted in one city, a CDN serves the content from whichever of its servers is closest to that visitor.

The result is faster load times, reduced load on your origin server, and improved reliability. For many websites, adding a CDN is one of the most impactful performance improvements available — especially for sites serving visitors across a wide geographic area.

How a CDN works

When a visitor requests a page on a CDN-enabled website, the request is routed to the nearest CDN edge server rather than directly to your hosting server. If that edge server has a cached copy of the requested files, it serves them instantly from memory — no round-trip to your origin server required. If the edge server does not have a cached copy (typically on first request after the cache expires), it fetches the file from your origin server, caches it, and serves it.

The performance improvement comes from physical proximity. A server in London responds to a London visitor in milliseconds; a server in Dallas adds hundreds of milliseconds of latency. For static assets — images, CSS files, JavaScript files — which make up the majority of a page's file weight, CDN delivery is substantially faster than origin server delivery for most visitors.

What a CDN improves and what it does not

A CDN improves the delivery of static assets: images, fonts, stylesheets and scripts. This directly improves Largest Contentful Paint and overall page load time, both of which affect Core Web Vitals and Google rankings. A CDN also provides resilience — if your origin server goes down, a CDN can continue serving cached content, keeping your site accessible to visitors.

A CDN does not fix a poorly coded website, a slow database, or a server that generates pages slowly. If your WordPress site generates pages dynamically on each request (as many do), the CDN will only cache the final HTML output if configured to do so, which requires more careful setup. For static sites or sites using page caching, CDN benefits are immediate and significant.

CDN options for small business websites

Cloudflare offers a free CDN tier that suits most small business websites. It proxies your website's traffic through its network, providing CDN caching, basic security (DDoS protection, bot filtering) and SSL. Setup takes under an hour and involves pointing your domain's DNS to Cloudflare's nameservers. For most small business websites, the free Cloudflare plan is sufficient.

Bunny CDN is a pay-as-you-go alternative that is exceptionally fast and affordable for businesses with heavier traffic or more specific performance requirements. AWS CloudFront and Fastly are enterprise options used at scale. For a typical small business WordPress or brochure site, starting with Cloudflare's free plan is the logical first step — it can be upgraded or replaced later if requirements change.