I’ve been an AWS advocate for years. But for my latest API project, I decided to try Cloudflare Workers. The result? 50% faster response times and a significantly lower bill.
The Problem with Lambda
My API had sporadic traffic. On AWS Lambda, this meant frequent “cold starts”—latency spikes of 500ms to 2 seconds while the container spun up. For a user-facing application, this was noticeable and annoying.
Enter Cloudflare Workers
Cloudflare Workers run on the V8 isolate engine directly at the edge. This implies:
- Zero Cold Starts: Code execution is near-instant.
- Global Distribution: The code runs in data centers close to the user, not just mostly in “us-east-1”.
The Migration Process
Moving from a Node.js Lambda to Workers wasn’t seamless. Workers don’t run Node.js; they run a V8 environment. I had to:
- Replace standard Node.js APIs (like
fs) with Web Standards. - Rethink database connections (I switched to Hyperdrive for connection pooling).
The Results
After a week of refactoring, the stats spoke for themselves:
- Average Latency: Dropped from 180ms to 45ms.
- Cold Start Latency: Eliminated.
- Cost: My bill went from ~$15/month to effectively $0 (the free tier is incredibly generous).
Conclusion
AWS Lambda still has its place for heavy computation, but for lightweight HTTP APIs, Cloudflare Workers is my new default.