What is a CDN?
A CDN, or content delivery network, serves a website's files from servers close to each visitor.
Definition
Copies of pages, images and scripts are cached around the world, so a visitor in Sydney and one in London both get fast responses.
Why it matters
It makes sites faster and more resilient under traffic spikes.
How to get it right
- Cache static assets long.
- Serve images in modern formats.
- Cache pages that do not change per visitor.
- Purge the cache when content updates.
Mistakes to avoid
- Caching personalised pages
- Never purging stale content
- Serving huge uncompressed files
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What is a CDN?
A CDN, or content delivery network, serves a website's files from servers close to each visitor. Copies of pages, images and scripts are cached around the world, so a visitor in Sydney and one in London both get fast responses.
Why does CDN matter?
It makes sites faster and more resilient under traffic spikes.
How do you get cdn right?
Cache static assets long. Serve images in modern formats. Cache pages that do not change per visitor. Purge the cache when content updates.
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