Do you need a CDN? When a content delivery network helps, and when it does not

A content delivery network (CDN) is a network of servers in many locations that cache copies of your content. Visitors are served from the nearest location instead of from your origin server.

What a CDN does well

• Faster static content: images, styles, scripts, fonts, videos and downloads load from nearby.
• Less load on your server: the CDN absorbs most requests for static files.
• Resilience to traffic spikes: cached content keeps serving during peaks.
• A protective layer: many CDNs filter attacks and hide your origin's address.

When it helps most

• Your visitors are in many countries, far from your server.
• Your pages are heavy with images or media.
• You have occasional large traffic spikes, such as campaigns or launches.
• You distribute large files or video.

When it helps less

• Your audience is mostly in one city or country and your server is already there. Static content gains little, though a CDN may still add protection.
• Your application is mostly dynamic, personalised responses. These go back to your origin anyway; improving server-side performance matters more.

Getting it right

• Cache static assets for a long time and use versioned file names, so updates are picked up immediately.
• Do not cache personalised or private pages.
• Keep your origin's IP address private, or attackers can bypass the CDN.
• Make sure SSL is configured end to end, not just between the visitor and the CDN.

How IDX helps

IDX hosting works with standard CDN services, and our team can help you put one in front of your site and configure caching rules. For customers in Egypt, IDX Egypt Servers keep your origin close to your users, so even uncached responses arrive quickly.