As per AWS said in https://aws.amazon.com/cn/blogs/aws/aws-lambda-functions-now-scale-12-times-faster-when-handling-high-volume-requests/ https://aws.amazon.com

As per AWS said in https://aws.amazon.com/cn/blogs/aws/aws-lambda-functions-now-scale-12-times-faster-when-handling-high-volume-requests/ https://aws.amazon.com/cn/blogs/aws/aws-lambda-functions-now... > Each synchronously invoked Lambda function now scales by 1,000 concurrent executions every 10 seconds.