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# Where Serverless Cold Start Time Actually Goes
- URL: https://debugly.dev/serverless-cold-start-breakdown/
- Published: 2025-12-09T14:00:00.000Z
- Updated: 2026-10-17T05:49:30.000Z
- Description: Everyone blames the platform. Most of a cold start is usually your own initialisation code, and you can measure exactly which part.
- Author: Rohit Bhadani
- Tags: Performance, DevOps, Node.js, Debugging

| Phase                       | Typical     | Who owns it |
| --------------------------- | ----------- | ----------- |
| Sandbox provisioning        | 50 to 200ms | Platform    |
| Runtime bootstrap           | 20 to 100ms | Platform    |
| Your code loading, imports  | 100ms to 3s | **You**     |
| Your init code, connections | 50ms to 2s  | **You**     |

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Published on [debugly.dev](https://debugly.dev/) by [Rohit Bhadani](https://debugly.dev/about/) | Founder of [Krova Cloud](https://krova.cloud/?ref=debugly.dev)