When our team first migrated our legacy Java 8 batch processing workloads to Java 21 on AWS Lambda, we saw a 40% cost increase compared to our on-premise baseline, driven almost entirely by cold start latency triggering excessive retry logic and idle billed duration. After a 3-month optimization sprint focused on Provisioned Concurrency tuning, we cut total Lambda spend by 55% — a $22,000 monthly reduction for a workload processing 12 million daily events — without sacrificing our 99.9% SLA.

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