AWS Lambda now supports SnapStart for Python and .NET functions

Starting today, you can use Lambda SnapStart with your functions that use the Python and .NET managed runtimes, to deliver as low as sub-second startup performance. Lambda SnapStart is an opt-in capability that makes it easier for you to build highly responsive and scalable applications without provisioning resources or implementing complex performance optimizations.

For latency sensitive applications that support unpredictable bursts of traffic, high startup latencies—known as cold starts—can cause delays in your users’ experience. Lambda SnapStart can improve startup times by initializing the function’s code ahead of time, taking a snapshot of the initialized execution environment, and caching it. When the function is invoked and subsequently scales up, Lambda SnapStart resumes new execution environments from the cached snapshot instead of initializing them from scratch, significantly improving startup latency. Lambda SnapStart is ideal for applications such as synchronous APIs, interactive microservices, data processing, and ML inference.

Lambda SnapStart for Python and .NET is generally available in the following AWS Regions: US East (Ohio, N. Virginia), US West (Oregon), Asia Pacific (Singapore, Tokyo, Sydney), and Europe (Frankfurt, Ireland, Stockholm).

You can activate SnapStart for new or existing Lambda functions running on Python 3.12 (and newer) and .NET 8 (and newer) using the AWS Lambda API, AWS Management Console, AWS Command Line Interface (AWS CLI), AWS Cloud Formation, AWS Serverless Application Model (AWS SAM), AWS SDK, and AWS Cloud Development Kit (AWS CDK). For more information, see the Lambda documentation, or the launch blog post. To learn more about pricing for SnapStart on Python and .NET, visit AWS Lambda Pricing