Cloudflare CDN vs Fastly: Deep Technical Comparison 2026
ServDigest Team
Cloudflare and Fastly are CDN providers that appear to do the same thing: accelerate content delivery. But under the hood — fundamentally different architecture, philosophy, and target audience. This comparison is for those who understand the difference between pull and push CDN, know what TTFB and edge computing mean, and choose by technical specs, not brand recognition.
Sites: cloudflare.com | fastly.com
Architecture: Pull vs Instant Purge
Cloudflare — pull-based CDN. Content is cached on first request: a Tokyo visitor requests a page → Cloudflare fetches it from the Amsterdam origin server → caches in Tokyo → subsequent requests are served from cache. Simple model, but the first visitor from each new region always gets a slow response.
Global network: 330+ points of presence across 120+ countries. The largest CDN network. For a site with a global audience, this means minimal latency from virtually anywhere.
Fastly — push/instant purge CDN. Content is loaded onto edge nodes before any user requests it. Bonus — instant cache purge: 150ms to remove content from all edge nodes. Cloudflare takes anywhere from a few seconds to 30 seconds. For a news site where freshness is critical, those 30 seconds are an eternity.
Fastly’s network is smaller: about 80 points, but strategically placed at key internet exchange points (IXPs). Quality over quantity — Fastly uses dedicated channels, not shared infrastructure.
Edge Computing: Workers vs Compute@Edge
This is where it gets interesting.
Cloudflare Workers: serverless functions at the edge running on the V8 engine (isolates). Support JavaScript, TypeScript, Rust (via wasm), Python (beta). Per-request execution model, runtime up to 30 seconds on paid plans. Access to KV storage (key-value, eventual consistency), Durable Objects (strong consistency), R2 (object storage with zero egress fees), and D1 (SQLite-compatible database).
Workers economics: /month for 10 million requests, then /bin/zsh.50 per million. Free tier: 100,000 requests/day.
Fastly Compute@Edge: serverless functions at the edge running on WebAssembly. Supports Rust, JavaScript, Go, Python — compiled to wasm. Starts in microseconds (wasm boots faster than V8 isolates). Access to Edge Dictionaries (read-only key-value at edge), Object Store (S3-compatible), and KV Store (read-write at edge).
Compute@Edge gives more control: modify requests and responses at the HTTP semantics level, manage caching programmatically, run A/B tests without third-party tools. Workers can do this too, but Fastly’s VCL model (below) is more natural for those working with HTTP at a low level.
VCL: The Language Cloudflare Doesn’t Have
Fastly uses Varnish Configuration Language (VCL) — a domain-specific language for caching logic. Not “checkboxes in an admin panel” — a full programming language for cache behavior. You can write: “for requests from Europe with User-Agent containing ‘Mobile,’ if the URL starts with /api/, set TTL to 60 seconds, but only if the response is 200, otherwise bypass.”
Cloudflare has Page Rules, Transform Rules, and Cache Rules — visual builders with limited flexibility. Workers can emulate VCL logic, but that’s writing code instead of configuration.
For a DevOps engineer familiar with Varnish, Fastly feels native. For a developer who wants to write TypeScript — Cloudflare Workers.
Performance Benchmarks
Independent CDNPerf benchmarks (June 2026):
| Metric | Cloudflare | Fastly |
|---|---|---|
| TTFB (global average) | 38 ms | 25 ms |
| TTFB (North America) | 22 ms | 18 ms |
| TTFB (Europe) | 28 ms | 21 ms |
| TTFB (Asia) | 52 ms | 34 ms |
| Throughput | 250 Tbps | 180 Tbps |
| Availability (SLA) | 99.9% (Business) | 99.99% |
| Cache purge time | 5-30 sec | 150 ms |
| DDoS protection | Built-in, unlimited | Basic (additional service needed) |
Fastly’s TTFB is consistently lower thanks to instant caching and dedicated channels. But the gap is narrowing — Cloudflare is investing aggressively in infrastructure.
DDoS and Security
Cloudflare is unrivaled here. Free DDoS protection (L3/L4 + L7), WAF with managed rules, Bot Management, Rate Limiting — all out of the box. Terabit-scale attack mitigation works on the free plan. This is why roughly 20% of all internet traffic passes through Cloudflare.
Fastly offers basic DDoS protection (L3/L4) for free, but full WAF and L7 protection cost extra. If you’re in an industry where DDoS attacks are a regular threat (gaming, finance, media), Cloudflare is the undisputed first line of defense.
Pricing: Predictable vs Flexible
Cloudflare: free plan includes CDN, DDoS, basic WAF, SSL. Pro (/month) adds Polish (image compression) and Mirage (mobile optimization). Business (/month) — 100% uptime SLA, custom certificates. Enterprise — custom pricing. Cloudflare’s appeal is that the free plan suffices for 90% of websites.
Fastly: pay-as-you-go. /bin/zsh.12/GB for the first 10 TB (decreases with volume), plus /bin/zsh.0075 per 10,000 requests. Free tier: credit. For a site with 1 TB monthly traffic: roughly + overage — 6x Cloudflare Pro. But for high-traffic sites (100+ TB), prices are comparable, and Fastly’s performance is higher.
Affiliate Programs
Cloudflare: affiliate program through PartnerStack. Commission: 20% of first-year subscription. Cloudflare offers a wide product range for upsell: Workers, Stream, Images, Zero Trust, Magic Transit. A customer might start with free CDN and a year later pay ,000/month for Enterprise — you earn commission on the upgrade. Cookie: 90 days.
Fastly: affiliate program with 15% of customer revenue during the first year. But Fastly’s average ticket is higher (enterprise clients), and customer lifetime value is greater. Partner portal provides technical docs, case studies, and dedicated support.
Affiliate strategy: Cloudflare for content affiliates (blogs, comparisons, reviews). Huge audience, multiple entry points (free CDN → paid plans → Enterprise). Fastly for niche technical affiliates (DevOps blogs, architecture consultants).
Who Should Choose What
Cloudflare if:
- you need built-in DDoS protection and WAF
- budget is limited (free plan covers most needs)
- you’re a TypeScript developer (Workers)
- you want the ecosystem: DNS, Zero Trust, Stream, R2 — all in one
- your site has a global audience where 330+ PoPs matter
Fastly if:
- TTFB is critical (streaming, real-time bidding, news)
- you need instant purge (under 200ms)
- you’re a DevOps engineer with Varnish experience who wants to program caching logic in VCL
- you need dedicated channels and guaranteed throughput
- 99.99% SLA is a hard requirement