Two CDN Worlds: Edge Computing vs Simplicity
Fastly and KeyCDN sit at opposite ends of the CDN market. Fastly is an engineering platform capable of running arbitrary code on edge nodes. KeyCDN is a maximally simple CDN with pay-as-you-go pricing and minimal barrier to entry. Both deliver content fast, but for fundamentally different audiences.
Network Architecture: Node Placement Strategy
Fastly builds fewer, more powerful edge nodes (~80), placing them at key internet exchange points (IXPs). Each node is a server cluster with SSD caching, Tier-1 peering, and the ability to run WebAssembly modules. Fastly doesn’t chase quantity — they concentrate power where traffic flows most.
KeyCDN uses a different strategy: 60+ PoPs with an emphasis on broad geographic coverage. Nodes span 40+ countries, including South America, Africa, and Southeast Asia — regions where Fastly has weak or zero presence. KeyCDN runs on rented infrastructure (bare-metal servers in partner data centers) rather than building its own nodes.
Coverage comparison by region:
| Region | Fastly | KeyCDN |
|---|---|---|
| North America | 20+ nodes, all major IXPs | 15+ nodes, including Midwest |
| Europe | 15+ nodes (AMS, LON, FRA, PAR, MAD) | 18+ nodes, including Eastern Europe |
| Asia | 6 nodes (TYO, SIN, HKG, OSA) | 10+ nodes (incl. Bangkok, Manila) |
| South America | 2 nodes (GRU, SCL) | 5+ nodes (incl. Bogotá, Buenos Aires) |
| Africa | 1 node (CPT) | 3+ nodes (incl. Johannesburg, Lagos) |
| Oceania | 2 nodes (SYD, MEL) | 2 nodes (SYD, AKL) |
| Middle East | 0 nodes | 2+ nodes (Dubai, Tel Aviv) |
For projects with a global audience including emerging markets, KeyCDN delivers better latency through physical proximity of nodes to users.
Performance: The Numbers
Synthetic benchmark (Catchpoint, averaged Q2 2026 data, cached 50 KB content):
| Metric | Fastly | KeyCDN |
|---|---|---|
| Avg response time (global) | 22 ms | 28 ms |
| P95 latency (US) | 8 ms | 14 ms |
| P95 latency (Europe) | 10 ms | 12 ms |
| P95 latency (Asia) | 55 ms | 35 ms |
| P95 latency (South America) | 90 ms | 40 ms |
| Cache purge time | <150 ms global | <1 s global |
| TTFB (cold cache, US) | 120 ms | 85 ms |
| Network throughput | 250+ Tbps | 50+ Tbps |
Fastly wins on major routes (US, Europe) thanks to Tier-1 peering and more powerful hardware. KeyCDN wins in regions with thin coverage — more nodes mean lower latency.
Edge Computing: The Key Differentiator
Fastly Compute@Edge is a full execution environment at the edge. Write code in Rust, JavaScript, Go, compile to WebAssembly, and deploy to Fastly nodes. Available: edge KV store reads/writes, request/response modification, A/B testing, geo-redirects, JWT verification, personalization without origin round-trip.
Example: an e-commerce site uses Compute@Edge to detect the user’s country via IP and display prices in local currency — before the request reaches origin. Zero additional latency.
KeyCDN does not offer edge computing as such. Edge Rules provide declarative configuration for header modification, redirects, and CORS — but it’s not code execution. A/B testing and personalization require an external service or origin-side logic.
Image Processing
Fastly Image Optimizer: resize, crop, format conversion (WebP, AVIF), rotation, watermarks, quality optimization — all via URL parameters. Processing happens at the edge on first request; results are cached.
https://img.example.com/photo.jpg?width=800&format=avif&quality=85KeyCDN Image Processing: comparable feature set: resize, crop, WebP/AVIF, quality, focus crop. The API is nearly identical; functionality is comparable.
https://img.keycdn.com/photo.jpg?width=800&format=avifBoth support automatic WebP and AVIF conversion. The difference is in processing and caching speed: Fastly does it via edge computing (<10 ms per transformation), KeyCDN via dedicated processing servers (15–30 ms).
Pricing: Pay-As-You-Go vs Contracts
KeyCDN:
- Traffic: from $0.04/GB (Asia) to $0.01/GB (Europe)
- Storage: $0.04/GB/month
- Image processing: $0.02 per 1,000 transformations
- Free Custom SSL, free Let’s Encrypt certificates
- Minimum payment: $49 (pay-as-you-go, not monthly)
Fastly:
- Traffic: prices not public, estimated from $0.08/GB
- Enterprise contracts with minimum monthly commitment
- Compute@Edge: from $0.60 per 1M requests
- WAF: additional charge
For a site with 500 GB/month traffic, KeyCDN costs approximately $10–25/month. Fastly will cost several times more but offers edge computing and real-time logging.
API and Automation
Fastly API is a full REST API covering every aspect of the platform. Implemented via Fastly CLI and Terraform provider. VCL (Varnish Configuration Language) is powerful but complex, requiring experience.
KeyCDN API is a REST API for managing zones, reports, and rules. Easier to learn but less flexible. CMS integration via plugins: WordPress, Drupal, Magento.
Which to Choose
Fastly — choose if:
- You need edge computing (custom edge logic, WebAssembly)
- Instant cache purging is critical (news, financial data)
- You require real-time analytics (log streaming, BigQuery integration)
- Your project is high-traffic: trillions of requests monthly
- You have engineering resources for VCL and Compute@Edge
KeyCDN — choose if:
- You need simple static asset delivery without complex logic
- Your audience is distributed across emerging regions
- Your budget is limited; you need pay-as-you-go
- You don’t want to learn VCL and WebAssembly
- You need quick CMS plugin integration
Verdict
Fastly and KeyCDN are less competitors than tools for different jobs. Fastly is a Swiss watch: precise, powerful, expensive, requiring skill to operate. KeyCDN is a reliable SUV: simpler, more affordable, goes where the pavement ends.
For a startup with audiences in Latin America that just needs to serve a landing page fast — KeyCDN. For a news portal with US and EU audiences needing 100 ms cache purges — Fastly. Choose by task, not by brand.