This post delves into the world of AWS Lambda costs, exploring how they are calculated and offering strategies for optimization. The author, Prashanth HN, shares insights on how to calculate your Lambda costs using tools like Lumigo-CLI and provides guidance on optimizing Lambda functions for better performance and cost savings. Key takeaways include understanding the relationship between allocated memory and runtime, using AWS Lambda Power Tuning to fine-tune memory/power configuration, and leveraging tree-shaking for optimal bundling of dependencies in NodeJS apps. Additionally, the post discusses other opportunities for reducing Lambda costs, such as optimizing for warm starts while using NodeJS and utilizing Lumigo's Lambda CPU Extension. The author invites readers to join a webinar on Lambda cost optimization, offering valuable information and exclusive rewards.