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AWS Certified Solutions Architect study material · question 460 of 500

Why do later invocations of a Lambda function often start faster than the first?

  1. Lambda reuses an existing execution environment and skips initialization
  2. Lambda caches the function's response
  3. Lambda increases the function's memory automatically
  4. Lambda moves the function to a nearer Region
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Answer: A. Lambda reuses an existing execution environment and skips initialization

Once a request completes, the environment can serve further requests without repeating the Init phase.

Source: Understanding Lambda function scaling (Amazon Web Services) — Understanding and visualizing concurrency

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