Today morning on a regular read I came across an interesting article published from a company called Prismatic one who developing a devops product for software development companies .
As part of their product deployment Prismatic used AWS Lambda for most of their services , but for a specific integrations they ran into performance issues because of limitations in AWS Lambda and later they had to move to AWS ECS.
Please find the detailed use case about AWS Lambda here https://prismatic.io/blog/why-we-moved-from-lambda-to-ecs