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AWS Services · Concept

Cold Start

A Lambda cold start is the setup work needed before a function runs in a new execution environment. It adds startup latency and can happen when Lambda cannot reuse an existing environment.

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  • Lambda execution environment
  • Provisioned Concurrency
  • static initialization
  • Lambda runtime
  • Lambda extensions

Source: Understanding the Lambda execution environment lifecycle - AWS Lambda. Checked 2026-11-03.