Performance Optimisation (1/6)
How does AWS Lambda scale?

    AWS Lambda is designed to scale automatically in response to incoming request volume. It handles the provisioning and management of the compute infrastructure, launching new instances of the function as needed. This makes Lambda ideal for unpredictable or highly variable workloads.

    Key Aspects of Lambda Scaling
    • Lambda scales horizontally by running multiple instances in parallel.
    • Each new event triggers a new instance (up to concurrency limits).
    • Cold starts may occur when new instances are launched.
    • Initial burst concurrency: up to 1,000 requests per Region by default.
    • Thereafter, it scales at 500 additional instances per minute.
    • You can configure reserved concurrency and provisioned concurrency for predictable performance.
    • No need to pre-scale manually—AWS manages it automatically.
    Example: Setting Reserved Concurrency Using AWS CLI