Match Lambda configuration knobs to outcomes

AWS Lambda exposes several configuration knobs, and each one solves a different production problem. Memory is the primary performance dial (Lambda allocates vCPU in proportion to memory), Timeout caps how long a single invocation may run, Reserved concurrency both guarantees and caps how many instances of a function can run, and Provisioned concurrency keeps instances pre-warmed to eliminate cold starts. Match each desired outcome to the setting that delivers it.