Serverless Cold-Start Latency Churn Penalty.

## The Hidden Cost of "Scale to Zero"

Serverless architecture (AWS Lambda, Vercel Functions) saves money by instantly scaling down to zero servers when traffic is low. But when a new user suddenly arrives, AWS must furiously boot up a virtual machine, load the Node.js runtime, grab environment variables, and execute the code. This is called a "Cold Start."

### FAQ

**Q: Who cares about 2.5 seconds of delay?**
A: If a user clicks an Instagram Ad on their iPhone, and staring at a blank screen for 3 seconds occurs before the UI paints because of a Lambda cold start, 20% to 30% of users will simply assume the app is broken and bounce immediately. You pay for the ad click, but capture $0 in revenue.