AWS Lambda now supports up to 5x faster polling scale-up rate (adding up to 300 concurrent executions per minute) for spiky Lambda workloads configured with Amazon Simple Queue Service (Amazon SQS) as an event source using Lambda event source mapping or Amazon EventBridge Pipes. This enables customers building event-driven applications using Lambda and SQS queues (standard or first-in, first-out) to achieve more responsive scaling during a sudden burst of messages in their queues, and reduces the need to duplicate Lambda functions or SQS queues to achieve faster message processing.
Source:: Amazon AWS