[thinkmassive]

This is why people using Lambda at scale are concerned with keeping the containers “warm” https://aws.amazon.com/blogs/compute/container-reuse-in-lamb...

[alanning]

Keep in mind that if you have any kind of fanout at scale, keeping a few lambda instances “warm” probably won’t improve your throughout much.

Update: found a nice article with metrics re: lambda-backed api gateway but the premise applies to any fan-out.

https://hackernoon.com/im-afraid-you-re-thinking-about-aws-l...

[zackbloom]

It's also worth pointing out that if your Lambda is in a VPC its cold start time can be over 10s.