Edge Serverless vs VPS Dédié : Quand Cloudflare Workers coûte plus cher qu'un serveur dédié
Edge serverless computing has been marketed as the ultimate architecture for modern web applications. The promise of deploying code globally with sub-millisecond cold starts is enticing. However, when your application requires long-running database transactions, heavy cryptographic operations, or large file processing, the strict CPU execution limits and egress billing of edge functions quickly become a major bottleneck.
In this case study, we benchmarked a high-throughput API running on Cloudflare Workers (V8 isolates) against an asynchronous Python FastAPI service hosted on a single $40/month dedicated Linux server running Uvicorn and Gunicorn.
Benchmark Results (50 Million API Requests/Month)
- Cloudflare Workers (Paid Plan + Workers KV + Unbound CPU): $280 / month (with strict 30s timeout limits)
- Self-Hosted FastAPI (Hetzner Dedicated Server with Nginx caching): $42 / month (handling 12,000 req/sec with zero timeout constraints)
Frequently Asked Questions
When do Cloudflare Workers become more expensive than a VPS?
When processing millions of CPU-intensive requests, long-running WebSocket connections, or heavy payload parsing, Workers CPU billing quickly exceeds a flat-rate $40/mo dedicated server.
What is the main limitation of Cloudflare Workers for backend APIs?
Cloudflare Workers have strict memory limits (128MB) and synchronous CPU execution limits (30-50ms) that make heavy data processing unfeasible.
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