A Content Delivery Network caches your content on servers around the world. Users load content from the nearest server ("edge") instead of your origin server. Result: faster load times globally.

Do I really need a CDN for my startup?

If your users are global or you serve significant static content (images, JS, CSS), yes. CDNs are often free (Cloudflare) or included (Vercel). Performance impacts conversions—every second counts.

Cloudflare, Bunny CDN, or Fastly?

Cloudflare is the default choice—generous free tier, excellent features. Bunny CDN is simple and affordable. Fastly is powerful but enterprise-focused. Vercel and Netlify include CDN by default. Start with Cloudflare.

Is Cloudflare really free?

Yes, Cloudflare's free plan includes CDN, SSL, DDoS protection, and basic features. It's legitimately useful for most startups. Paid plans add analytics, optimization, and advanced security.

How do I set up a CDN?

For Cloudflare: point your domain's nameservers to Cloudflare. They proxy your traffic automatically. For other CDNs: configure CNAME records to point to CDN domains. Most platforms have step-by-step guides.

What content should be cached?

Static content: images, CSS, JavaScript, fonts. Don't cache dynamic API responses or user-specific content without careful cache headers. CDNs respect your cache-control headers.

What are cache headers?

HTTP headers that tell browsers and CDNs how long to cache content. Cache-Control: max-age=3600 means cache for 1 hour. Set appropriate TTLs for different content types. Longer caching = better performance.

How do I purge cached content?

CDNs have APIs and dashboards to purge cache instantly. Purge when you deploy new versions. Or use cache-busting: append version numbers to file URLs so cached versions aren't served.

What is cache invalidation?

Telling the CDN to fetch fresh content instead of serving cached versions. Can purge by URL, tag, or entire cache. Important when content updates frequently. Some say it's one of computing's hard problems.

What are edge functions?

Code that runs at CDN edge locations, not your origin server. Cloudflare Workers, Vercel Edge Functions. Use for fast personalization, A/B tests, and auth without origin round trips.

How does a CDN improve security?

CDNs absorb DDoS attacks, provide free SSL, and hide your origin server IP. Cloudflare's free plan includes basic DDoS protection. Your origin only handles traffic the CDN passes through.

What is image optimization?

CDNs can resize, compress, and format-convert images on the fly. Serve WebP to browsers that support it. Cloudflare Polish and Bunny Optimizer do this automatically. Smaller images = faster pages.

What are Core Web Vitals?

Google's metrics for page experience: LCP (largest content load time), FID (interactivity), CLS (visual stability). CDNs improve LCP significantly. Core Web Vitals affect SEO rankings.

How do I test CDN performance?

Use WebPageTest from different global locations. Check if resources are served from CDN (cache-status headers). Compare load times before and after CDN. Lighthouse audits show opportunities.

What is latency and how do CDNs help?

Latency is the delay from request to response. Distance matters—requests to servers across the world take longer. CDNs put content closer to users, reducing latency. Particularly noticeable for first loads.

Should I put my API behind a CDN?

Dynamic APIs usually aren't cached, but CDNs still help with SSL termination and protection. Some API responses can be cached (GET requests that rarely change). Evaluate on a case-by-case basis.

What is WAF (Web Application Firewall)?

Firewall rules that block malicious web traffic: SQL injection, XSS attacks, bot abuse. Cloudflare and Fastly include WAF features. An additional security layer between the internet and your app.

How do I handle videos?

Videos need specialized CDNs or video platforms (Mux, Cloudflare Stream). They handle transcoding, adaptive bitrate, and global delivery. Don't try to serve large videos through generic CDN—use dedicated video infrastructure.

Back to all problems

Solution illustration for I need to improve website speed globally

Nice to Have

Best CDN & Website Performance Tools for Startups

Fast websites win—cache content at the edge, globally.

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Technical

About This Problem

Users expect fast websites everywhere. CDNs cache your content on servers worldwide, reducing load times for global users. Performance directly impacts conversion rates and SEO.

You might have this problem if:

✓Site is slow for international users
✓Large images slowing down pages
✓High server load from static content
✓Poor Core Web Vitals scores
✓Want to cache content closer to users

Success Looks Like

CDN configured and serving content
Improved load times globally
Core Web Vitals improving

Relevant For

launch stagegrowth stagescale stage

A CDN for your startup caches your website content on servers around the world, so pages load fast no matter where your users are. Slow websites kill conversion rates and hurt your search rankings. Whether you are serving images, static pages, or API responses, a content delivery network dramatically reduces load times. Compare the best CDN and performance tools with free tiers and easy setup for startup teams.

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Cloudflare

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Bunny CDN

Content delivery made easy.

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Fastly

The edge cloud platform.

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About This Problem

Users expect fast websites everywhere. CDNs cache your content on servers worldwide, reducing load times for global users. Performance directly impacts conversion rates and SEO.