What does the CDN check look for?
It looks for indicators that your content is delivered through a content delivery network rather than served directly from a single origin. Specifically:
- CDN delivery — response headers and behaviour suggesting a CDN is sitting in front of your origin.
- Edge caching — whether static assets appear to be cached and served from edge locations.
- Distribution — whether content is positioned to be served close to users rather than from one distant server.
Content delivered via a CDN passes; partial CDN use (some assets but not the main delivery) is a warning; no CDN, with everything served from a single origin, is a fail.
How is it evaluated, and how is it scored?
GEObubbly inspects response headers and delivery characteristics for signs of CDN use. It's an extended Performance check that runs partially, since detecting a CDN depends on how the live site responds.
Why CDN usage matters for SEO and GEO
A content delivery network is a global network of edge servers that cache and serve your content from a location physically close to each visitor. The benefit is latency: a request that would otherwise travel thousands of miles to a single origin and back is instead answered nearby, which lowers server response time and speeds up loading for users far from where your site is hosted. A CDN also offloads work from your origin (it serves cached assets so your server handles fewer requests), absorbs traffic spikes, and typically adds compression and modern protocols. For a site with a geographically spread audience, a CDN is one of the most effective performance upgrades available, improving Core Web Vitals for distant users in particular. It's not strictly required — a fast origin serving a local audience may not need one — which is why this is an extended rather than core check. For crawling, faster global delivery helps engines, including AI crawlers, fetch your pages efficiently wherever they request from.