CDN (Content Delivery Network)
A Content Delivery Network (CDN) is a globally distributed network of edge servers that delivers static content from the geographically nearest node instead of always from the origin server. This reduces latency, offloads the main server and improves Load Time for users regardless of their location. For businesses targeting a German or European audience, choosing a GDPR-compliant CDN provider is critical.
Why is a CDN relevant for website performance?
Without a CDN, a single server in Frankfurt handles all requests – even from users in Munich, Vienna or Zurich. Every bit of distance means measurable latency. A CDN caches static assets (images, CSS, JS bundles) on edge nodes and serves them from there. This reduces Time to First Byte (TTFB), offloads the origin server and directly improves the Largest Contentful Paint – one of the three Core Web Vitals that counts as a Google ranking factor.
How does a CDN work technically?
On the first request for a resource, the edge server fetches the file from the origin server and stores it locally in cache (TTL-controlled). All subsequent requests are answered directly from the edge node. Providers like Cloudflare, Fastly, Bunny.net or AWS CloudFront operate hundreds of such nodes worldwide. DNS-based routing (Anycast) automatically directs users to the nearest node. Caching strategies with correct HTTP headers control which content is cached and for how long.
CDN in practice: static assets and GDPR
Ideal for CDN delivery are immutable static assets: compiled JS bundles, CSS files, WebP images, fonts. Dynamic content (personalized API responses, session data) does not belong in the CDN cache. For German businesses: CDN providers with US-based servers potentially transfer personally identifiable IP addresses to third countries. Under GDPR, this is problematic without Standard Contractual Clauses. The Server Location remains a compliance concern even when using a CDN.
Common mistakes and misconceptions
The most common mistake: dynamic or user-specific content is accidentally cached and served to other users – both a privacy and functionality problem. Another mistake: missing or overly short cache TTLs for immutable assets. Integrating a CDN without a prior Caching Strategy also leads to inconsistent results. Using CDN providers without a GDPR review is an avoidable compliance risk for German business websites.
How we use it
At BTECH Solutions, we evaluate CDN usage on a project-by-project basis: for SME websites with a German audience, our Static Site Generation approach with Apache caching often delivers comparable TTFB values to a paid CDN. For international traffic, we recommend Bunny.net with EU nodes as a GDPR-compliant alternative. For a travel project with visitors from Asia and Europe, a CDN reduced TTFB from 1.2 to 0.3 seconds.