AWS Guide: How to Optimize Lambda, Caching, and Messaging for Better App Performance

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AWS Developer Associate exam Domain 4 covers techniques for optimizing cloud applications using key AWS services and features. Lambda performance can be tuned through concurrency settings—unreserved, reserved, and provisioned—each serving different use cases around capacity, cost, and cold start elimination. Caching strategies span multiple layers, including CloudFront at the edge, API Gateway at the API level, ElastiCache for application-layer data, and DAX for DynamoDB reads, with patterns like cache-aside and write-through suited to different consistency needs. SNS filter policies help reduce unnecessary downstream processing by ensuring subscribers only receive relevant messages. Metrics such as Lambda Duration, IteratorAge, and SQS ApproximateAgeOfOldestMessage serve as key indicators for diagnosing bottlenecks like high latency, throttling, or stream lag.

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