A CDN is a network of servers spread across the globe that cache and serve your static assets — images, CSS, JavaScript, fonts — from whichever server is physically closest to the visitor. Without one, a visitor in Tokyo requesting your page hosted in Virginia is waiting for data to travel 10,000+ miles each way.
The speed impact is significant. Moving from a single-origin server to a CDN typically cuts Time to First Byte by 40-60% for geographically distant visitors. If you're running international paid campaigns and your landing page is hosted on a single US server, you're burning ad spend on visitors who wait 3+ seconds for your page to start rendering. Most of them leave before they see your headline.
CDN setup is easier than you think
Modern hosting platforms (Vercel, Netlify, Cloudflare Pages) include CDN distribution by default. If you're on traditional hosting, Cloudflare's free tier provides CDN caching with a DNS change. The ROI is almost always positive — especially if you have traffic from more than one continent.
One caveat: CDNs help most with static assets. If your landing page relies heavily on server-side personalization, the CDN cache might get bypassed on every request. For personalized pages, look at edge computing solutions that run your logic at CDN nodes rather than a central server.