intermediatetermPerformancePerformance / Cold Starts
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Cold Starts

The execution delay experienced when a serverless function spins up a new runtime container on a first invocation.

Definition

The execution delay experienced when a serverless function spins up a new runtime container on a first invocation.

Use case

Keeping AWS Lambda or Vercel edge functions warm with scheduled pings to eliminate 2-second initial response delays.

Related terms

Articles

Keep your lambdas warm

Serverless · Article · link checked 2026-10-16

Why the first serverless call is slow, and how teams hide it.

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