Three years ago, I ran an e-commerce site making about $40,000 a month. Then Google rolled out their Core Web Vitals update, and our rankings tanked. Not because our products got worse. Not because our content sucked. Because our site was slow in Asia and South America — markets that accounted for 35% of our revenue.
The fix? A proper CDN. But choosing the wrong one first cost me two months and roughly $12,000 in lost sales.
I don't want anyone else to make that mistake. So I did something a little crazy: I set up identical test sites across seven CDN providers and measured real-world performance from 12 countries over 30 days.
What a CDN Actually Does (The Honest Version)
Most CDN explainers make it sound magical. "Your content, delivered from the edge!" Sure. But let me give you an analogy that actually helps.
Imagine you run a pizza shop in Chicago. Someone in Tokyo orders a pizza. You could ship it — but it'll arrive cold, soggy, and three days late. Or, you could have a kitchen in Tokyo with your dough, sauce, and toppings ready to go. That's a CDN. Pre-positioned copies of your website's assets in kitchens around the world.
The difference between a good CDN and a bad one is how many kitchens they have, how fresh the ingredients are (cache invalidation), and whether the Tokyo kitchen actually knows how to make your specific pizza (edge computing).
My Testing Methodology
I deployed an identical static site (2.3MB, 47 assets) across all seven CDNs. Then I used synthetic monitoring from 12 cities — New York, London, Frankfurt, Tokyo, Sydney, Sao Paulo, Mumbai, Singapore, Johannesburg, Toronto, Dubai, Seoul.
- Tests every 15 minutes for 30 days
- Metrics: TTFB, full page load, cache hit ratio, TLS handshake
- ~290,000 data points per CDN
The Results
| CDN | Avg TTFB | Avg Load | Cache Hit | PoPs | Price | Score |
|---|---|---|---|---|---|---|
| Cloudflare | 28ms | 0.42s | 98.7% | 310+ | Free-$200+ | 9.5/10 |
| Bunny CDN | 31ms | 0.45s | 97.9% | 123 | $0.01/GB | 9.2/10 |
| Fastly | 26ms | 0.40s | 99.1% | 90+ | $0.12/GB | 9.0/10 |
| AWS CloudFront | 33ms | 0.48s | 97.2% | 450+ | $0.085/GB | 8.7/10 |
| KeyCDN | 35ms | 0.51s | 96.8% | 60+ | $0.04/GB | 8.3/10 |
| Akamai | 29ms | 0.43s | 98.3% | 4100+ | Enterprise | 8.0/10 |
| StackPath | 39ms | 0.56s | 95.4% | 65+ | $0.04/GB | 7.5/10 |
1. Cloudflare — Still the King, and It's Not Even Close
I know, I know. "Cloudflare wins CDN comparison" isn't exactly breaking news. But the margin surprised even me.
Cloudflare's free tier outperformed paid plans from three other CDNs on this list. Let that sink in. A product that costs zero dollars beat products that cost hundreds.
How Is the Free Tier This Good?
Because Cloudflare doesn't make money from CDN. They make money from enterprise security, Workers, and R2 storage. The CDN is a loss leader. It's like how Google gives away Gmail to sell ads — except Cloudflare gives away a CDN to sell Zero Trust security.
According to W3Techs, Cloudflare now powers over 20% of all websites globally. That network effect creates a self-reinforcing advantage.
The Pro Plan Sweet Spot
For $20/month, the Pro plan adds WAF, image optimization, and faster cache purge. For most SMBs, this is the sweet spot — enterprise-grade security for less than Netflix.
The Pro plan showed a 12% TTFB improvement over free, primarily from Argo Smart Routing.
Where Cloudflare Struggles
Video delivery. Their ToS actually prohibits using free/Pro plans as a video CDN. You need their Stream product for that. For video-heavy sites, Bunny CDN or CloudFront work better.
2. Bunny CDN — The Best Value in the Business
Bunny CDN is the indie darling of the CDN world, and for good reason. At $0.01 per GB (yes, one cent), it's absurdly cheap. And the performance is within spitting distance of Cloudflare.
Here's a story: I helped a friend migrate his photography portfolio (15GB of images, 50,000 monthly visitors) from basic shared hosting. His hosting bill was $30/month, site loaded in 4.2 seconds. I put Bunny CDN in front of it — total cost: about $2.50/month. Load time dropped to 0.9 seconds. Bounce rate fell 40% the first month.
$2.50 a month. That's not a typo.
Bunny's Secret Weapon: Bunny Optimizer
For an extra $9.50/month, Bunny Optimizer auto-compresses images, converts to WebP/AVIF, and lazy-loads off-screen content. For WordPress sites, this is a massive time-saver.
The Catch
123 PoPs vs Cloudflare's 310+. In practice, slightly higher latency in uncommon regions. From Johannesburg: Bunny averaged 67ms TTFB vs Cloudflare's 41ms. For most use cases, imperceptible. But if you have significant African or rural Southeast Asian traffic, it matters.
3. Fastly — The Performance Purist's Pick
Fastly had the lowest raw TTFB: 26ms average. It's the Formula 1 car of CDNs — blindingly fast, beautifully engineered, and expensive to maintain.
What sets Fastly apart is instant cache purging — about 150 milliseconds globally. Most CDNs take 30 seconds to minutes. If you run a news site or real-time application, this matters enormously.
The New York Times, GitHub, and Stripe all use Fastly. Not a coincidence.
Why It's Not Number 1
Price. $0.12/GB in North America. For 1TB monthly traffic, that's $120 just for CDN. Cloudflare? Free. Bunny? $10. And the VCL configuration language is complex — it's like giving someone a manual transmission when they just want to drive to the grocery store.
4. AWS CloudFront — The Enterprise Default
CloudFront wins by ecosystem, not raw performance. If you're already on AWS — S3, EC2, Lambda — CloudFront is the obvious choice. The integration is seamless.
Amazon reports CloudFront serves over 100 exabytes per year across 450+ edge locations. But TTFB of 33ms put it behind Cloudflare and Fastly.
The pricing is also confusing. Request fees, invalidation fees, Lambda@Edge execution fees... my AWS bill for the test was 40% higher than estimated. Classic AWS.
5. KeyCDN — The Quiet Workhorse
KeyCDN doesn't get the attention it deserves. $0.04/GB with a $4/month minimum. The dashboard is refreshingly simple. Performance was solid — 35ms average TTFB, 96.8% cache hit rate. For small to medium sites wanting simplicity, it's solid.
6. Akamai — The Original Giant
Akamai invented the CDN in 1998. They have 4,100+ PoPs and deliver about 30% of all internet traffic. But it's enterprise-only. No public pricing, no self-service. You call sales and negotiate. Their tech is phenomenal (29ms average TTFB), but the barrier is too high for anyone except large corporations.
7. StackPath — The Disappointment
I wanted to like StackPath. The pricing is fair, the feature set looks good on paper. But 39ms TTFB and a 95.4% cache hit rate were consistently the weakest. That means roughly 1 in 20 requests went back to origin. At scale, that adds up.
What Nobody Tells You About CDN Setup
Here's what frustrates me about CDN marketing: they all make it sound like flipping a switch. A CDN only accelerates what you tell it to cache. If your cache headers are wrong — and most sites' headers are wrong — your CDN is basically an expensive proxy.
According to the HTTP Archive's 2025 Web Almanac, 43% of websites have suboptimal caching configurations. Nearly half of all CDN customers are leaving performance on the table.
My Recommendation
For 90% of websites: Cloudflare free or Pro. The performance is excellent, security included, price unbeatable.
For heavy bandwidth on a budget: Bunny CDN. Save hundreds per month with minimal performance trade-off.
For performance-critical apps: Fastly. When milliseconds matter and you have the budget.
For AWS shops: CloudFront. Don't fight the ecosystem.
And for everyone: please configure your cache headers properly. The best CDN in the world can't fix bad caching policy.
FAQs
Do I need a CDN if my audience is in one country?
Yes, but less urgently. Even within the US, distance from Virginia to California adds 70-80ms latency. Plus CDNs provide DDoS protection and reduce origin load.
Can I use multiple CDNs?
Technically yes (multi-CDN), but it adds complexity. Large enterprises like Netflix do this, but for most sites, one well-configured CDN is plenty.
Does a CDN help with SEO?
Indirectly, yes. Google uses Core Web Vitals as a ranking signal. A 2025 Ahrefs study found top 10 Google results had average TTFB of 0.4 seconds — half the average of sites ranking 50+.
CDN vs hosting provider?
Hosting stores and runs your website. A CDN caches copies of static assets worldwide. Think of hosting as the factory and CDN as the warehouse network.
