In every software application, there are usually two main reasons to cache data: a) to improve performance and b) to reduce costs. Caching in AWS Lambda is not different. Instead, the reasons for caching might be even more important in this context. This blog post explains why it could be necessary for you and shows how to implement different caching options. In other words: How to find the best AWS Lambda cache option! This blog post is based on a talk I gave at the AWS User Group Stuttgart meetup in December 2018. You can find the slides here and the code is provided in this GitHub repo.