CDN
Content Delivery Network
In one line
A CDN (Content Delivery Network) caches your content on edge servers worldwide so users are served from a nearby node — directly improving TTFB, LCP and overall page speed.
Going deeper
A CDN caches your content on edge servers around the world so requests are served from a node near the user. Cloudflare, Akamai, Fastly and CloudFront are the usual suspects.
The direct SEO win is speed. CDNs cut TTFB and pull LCP forward, which is what Core Web Vitals actually measures. Sites heavy on static assets — images, scripts, fonts — see the biggest delta.
Two failure modes to watch. Misconfigured cache headers can keep stale versions live longer than they should, and CDN bot-protection rules sometimes block legitimate crawlers like Googlebot or GPTBot alongside the bad traffic.
Related terms
Technical SEO
Technical SEO is the infrastructure-level work — crawling, indexing, rendering, speed, structured data — that makes a site readable and rankable for search engines in the first place.
SEOTTFB
TTFB (Time to First Byte) measures how long it takes from a request being sent until the first byte of the response arrives — a foundational metric for server responsiveness and LCP work.
SEOFCP
FCP (First Contentful Paint) measures the moment any meaningful content — text or image — first appears on screen, used as a supporting page-speed metric alongside Core Web Vitals.
SEOHTTPS
HTTPS (HyperText Transfer Protocol Secure) is HTTP traffic encrypted with TLS — and a baseline ranking signal Google has confirmed publicly.
SEOMobile SEO
Mobile SEO covers the rendering, speed and UX of your site on mobile devices — effectively a baseline expectation since Google moved to mobile-first indexing.
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