CDN
Also called: content delivery network, content distribution network
A content delivery network (CDN) is a geographically distributed group of servers that cache and serve a website's assets (HTML, CSS, JavaScript, images, video) from an edge location close to each visitor, cutting network latency and speeding up page loads.
How a CDN speeds up delivery
Without a CDN, every request goes to your single origin server, so load time scales with the physical distance between the visitor and that server. Cloudflare’s reference architecture describes latency as “proportional to the distance between the client and origin server.” A CDN puts cached copies in points of presence worldwide, so a shopper in Madrid pulls your images from a nearby edge node instead of a box in Virginia. Cloudflare states its network reaches 95% of the internet-connected population within 50 milliseconds.
The metric a CDN moves most directly is Time to First Byte. Google’s web.dev guide lists adopting a CDN as a high-priority TTFB fix, and notes edge servers also serve content over modern protocols like HTTP/2 and HTTP/3 with faster TLS negotiation. TTFB is not itself a Core Web Vital, but it “precedes user-centric metrics such as First Contentful Paint (FCP) and Largest Contentful Paint (LCP),” so a lower TTFB gives LCP a head start. A CDN also offloads requests from your origin, which helps uptime under load and can make crawling more efficient.
A CDN is not a ranking button. It will not fix thin content, weak internal linking, or a slow database query on the origin. What it removes is network distance as a bottleneck, which is often the cheapest speed win available.
How it affects your traffic
Search engines do not rank you higher just for running a CDN, but the speed it delivers feeds signals they do use. Faster LCP and TTFB strengthen Core Web Vitals, which can help when your page and a competitor's are otherwise close on relevance and links. For any site serving visitors across regions, a CDN is usually the first technical fix worth making. In a Technical SEO engagement we verify the CDN is actually caching (not passing every request through to origin), serving compressed assets over modern protocols, and not blocking Googlebot, so it turns into measurable Core Web Vitals gains instead of a misconfigured pass-through.
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