# AWS Lambda optimization | Cloud Efficiency Hub Canonical: https://www.pointfive.co/efficiency-hub/cloud-services/aws-lambda 12 documented AWS Lambda cost inefficiencies, each with how to detect it and how to fix it. [Cloud Efficiency Hub](https://www.pointfive.co/efficiency-hub) 12 documented AWS Lambda cost inefficiencies, each with how to detect it and how to fix it. ## 12 inefficiencies [All services](https://www.pointfive.co/efficiency-hub#browse-by-service) - AWS Lambda CER-0296 ### [Inefficient Lambda Pricing Model for Steady High-Volume Workloads (Use Lambda Managed Instances)](https://www.pointfive.co/efficiency-hub/inefficiencies/inefficient-lambda-pricing-for-steady-high-volume-workloads-use-lambda-managed-instances) A function has steady, high-volume traffic (or predictable load) but continues running on default Lambda pricing, where costs scale with execution duration. Lambda Managed Instances runs Lambda on EC2 capacity managed by Lambda and... Compute - AWS Lambda CER-0290 ### [Unnecessary Lambda Provisioned Concurrency on Low-Utilization Functions](https://www.pointfive.co/efficiency-hub/inefficiencies/unnecessary-lambda-provisioned-concurrency-on-low-utilization-functions) Provisioned Concurrency is enabled for Lambda functions that do not require consistently low latency or steady traffic. In such cases, provisioned concurrency remains allocated and billed during idle periods, creating ongoing cost without... Compute - AWS Lambda CER-0209 ### [Unnecessary Costs from Unused Lambda Versions with SnapStart](https://www.pointfive.co/efficiency-hub/inefficiencies/unnecessary-costs-from-unused-lambda-versions-with-snapstart) Many teams publish new Lambda versions frequently (e.g., through CI/CD pipelines) but do not clean up old ones. When SnapStart is enabled on Python or .NET functions, each of these versions retains a cached snapshot, generating ongoing... Compute - AWS Lambda CER-0204 ### [Inefficient SnapStart Configuration in Lambda](https://www.pointfive.co/efficiency-hub/inefficiencies/inefficient-snapstart-configuration-in-lambda) SnapStart reduces cold-start latency, but when configured inefficiently, it can increase costs. For Python and .NET functions, high-traffic workloads can trigger frequent snapshot restorations, multiplying costs. Slow initialization code... Compute - AWS Lambda CER-0124 ### [Overreliance on Lambda at Sustained Scale](https://www.pointfive.co/efficiency-hub/inefficiencies/overreliance-on-lambda-at-sustained-scale) Lambda is designed for simplicity and elasticity, but its pricing model becomes expensive at scale. When a function runs frequently (e.g., millions of invocations per day) or for extended durations, the cumulative cost may exceed that of... Compute - AWS Lambda CER-0230 ### [Excessive Lambda Duration from Synchronous Waiting](https://www.pointfive.co/efficiency-hub/inefficiencies/excessive-lambda-duration-from-synchronous-waiting) Some Lambda functions perform synchronous calls to other services, APIs, or internal microservices and wait for the response before proceeding. During this time, the Lambda is idle from a compute perspective but still fully billed. This... Compute - AWS Lambda CER-0218 ### [Suboptimal Architecture Selection in AWS Lambda](https://www.pointfive.co/efficiency-hub/inefficiencies/suboptimal-architecture-selection-in-aws-lambda) Lambda functions default to the x86\_64 architecture, which is more expensive than Arm64. For many workloads, especially those written in interpreted languages (e.g., Python, Node.js) or compiled to architecture-neutral bytecode (e.g.,... Compute - AWS Lambda CER-0213 ### [Excessive Lambda Retries (Retry Storms)](https://www.pointfive.co/efficiency-hub/inefficiencies/excessive-lambda-retries-retry-storms) Retry storms occur when a function fails and is automatically retried repeatedly by the service that invoked it: asynchronous invocations (e.g., EventBridge, SNS, S3) are retried twice by default after function errors, SQS event source... Compute - AWS Lambda CER-0165 ### [Recursive Lambda Function Invocation](https://www.pointfive.co/efficiency-hub/inefficiencies/recursive-lambda-function-invocation) Recursive invocation occurs when a Lambda function triggers itself directly or indirectly, often through an event source like SQS, SNS, or another Lambda. This loop can be unintentional - for example, when the function writes output to a... Compute - AWS Lambda CER-0207 ### [Recursive Invocation Loop Between Lambda and SQS](https://www.pointfive.co/efficiency-hub/inefficiencies/recursive-invocation-loop-between-lambda-and-sqs) When a Lambda function processes messages from an SQS queue but fails to handle certain messages properly, the same messages may be returned to the queue and retried repeatedly. In some cases, especially if the Lambda is also writing... Compute - AWS Lambda CER-0103 ### [Overprovisioned Memory Allocation for Lambda Functions](https://www.pointfive.co/efficiency-hub/inefficiencies/overprovisioned-memory-allocation-for-lambda-functions) Each Lambda function must be configured with a memory setting, which indirectly controls the amount of CPU and networking performance allocated. In many environments, memory settings are defined arbitrarily or left unchanged as functions... Compute - AWS Lambda CER-0358 ### [Lambda Functions Frequently Timing Out](https://www.pointfive.co/efficiency-hub/inefficiencies/lambda-functions-frequently-timing-out) A Lambda invocation that hits its configured timeout is stopped by the runtime and returned as a function error, but the time it ran up to that limit is still billed. The work it was doing is usually lost, so the invocation is paid for in... Compute ## More AWS services - [AWS EC2 23](https://www.pointfive.co/efficiency-hub/cloud-services/aws-ec2) - [AWS RDS 19](https://www.pointfive.co/efficiency-hub/cloud-services/aws-rds) - [AWS S3 15](https://www.pointfive.co/efficiency-hub/cloud-services/aws-s3) - [AWS EBS 10](https://www.pointfive.co/efficiency-hub/cloud-services/aws-ebs) - [AWS CloudWatch 8](https://www.pointfive.co/efficiency-hub/cloud-services/aws-cloudwatch) - [AWS EKS 8](https://www.pointfive.co/efficiency-hub/cloud-services/aws-eks) - [AWS ElastiCache 8](https://www.pointfive.co/efficiency-hub/cloud-services/aws-elasticache) - [AWS DynamoDB 7](https://www.pointfive.co/efficiency-hub/cloud-services/aws-dynamodb) - [AWS Bedrock 6](https://www.pointfive.co/efficiency-hub/cloud-services/aws-bedrock) - [AWS ELB 6](https://www.pointfive.co/efficiency-hub/cloud-services/aws-elb) --- Source: the public page above. Product screenshots and illustrative interfaces are examples, not live customer data.