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A Lambda function processes S3 events at high frequency. Cost is dominated by execution time. Which optimisation has the BIGGEST impact?
AProfile and reduce wall-clock time (memory tuning + caching downstream calls + Lambda runtime choice if applicable)
BReduce memory below the minimum
CSwitch to Amazon Snowball
DDisable CloudWatch logging
Answer & Solution
Correct answer: A. Profile and reduce wall-clock time (memory tuning + caching downstream calls + Lambda runtime choice if applicable)
Lambda bills per ms; cutting that figure cuts the bill. Snowball is unrelated; disabling logs cripples ops; under-provisioning memory often increases wall-clock time and cost.
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