← Glossary
Cold Start
The delay before a serverless function or newly-scaled system is actually ready to handle a request.
When a serverless function hasn't run recently, the platform has to initialize it before it can process a request — adding latency to that first request that a continuously-running server wouldn't have. This is a real tradeoff of serverless architecture, not a bug, and matters most for latency-sensitive, infrequently-triggered workloads.
Where this shows up in practice
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