Key takeaways
- A CDN (content delivery network) stores copies of your site’s files on servers around the world and serves them from the location closest to each visitor.
- It speeds up loading, reduces server load and often adds security (DDoS protection, firewall).
- Most business sites benefit; Cloudflare’s free plan is an easy starting point.
If your server is in Mumbai and a visitor is in London, every request travels thousands of kilometres. A CDN shortens that trip by caching your files at “edge” locations near visitors. It’s one of the simplest performance upgrades available.
What a CDN caches#
| Content | Typically cached? |
|---|---|
| Images, CSS, JavaScript, fonts | Yes — the main use |
| Videos and downloads | Yes (some plans/services) |
| HTML pages | Optional — “full-page” or edge caching |
| Logged-in pages, cart, checkout, admin | Must not be cached |
Benefits#
- Faster loading for visitors far from your server — lower latency, better LCP.
- Less server load — fewer requests hit your hosting.
- Reliability — some CDNs serve cached pages if your server is briefly down.
- Security — DDoS mitigation, web application firewall, bot management.
- Modern protocols — HTTP/3, Brotli compression, TLS 1.3 by default.
- Image optimisation — some CDNs resize and convert images on the fly.
Popular CDNs#
- Cloudflare — free plan with DNS, CDN, SSL and firewall; easy for WordPress — see Cloudflare setup.
- Bunny.net — affordable, pay-as-you-go, good image optimisation.
- Host-included CDNs — many managed hosts include one.
- Amazon CloudFront, Fastly, Akamai — enterprise and app use cases.
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Do you need one?#
| Situation | Recommendation |
|---|---|
| Visitors mostly in one city, server nearby | Helpful but optional; good for security |
| Visitors across India or worldwide | Yes |
| Image-heavy sites, stores | Yes |
| Traffic spikes from campaigns | Yes |
Common pitfalls#
- Caching pages that should be private (cart, account) — set bypass rules.
- Stale content after updates — purge the CDN cache when you publish or change CSS/JS.
- Double caching conflicts with plugins — configure them to work together.
- Blocking legitimate bots with overly aggressive security settings — verify Googlebot can crawl.
CDN FAQ#
Does a CDN help SEO?#
Indirectly — by improving speed and reliability. Google sees the same content.
Will a CDN fix a slow server?#
It helps with static files and cached pages, but slow uncached requests (admin, checkout) still depend on your server.
Is Cloudflare free really enough?#
For many small and medium sites, yes. Paid plans add features like advanced image optimisation and more control.