Poor cold start performance on AWS Lambda

[jyecusch]

The first cold start for a new function in AWS Lambda takes significantly longer than subsequent requests or even subsequent cold starts.

Here is an example of the behavior from a recent test:

Result	Description
9.56s	First request in this region (no previous deployments of this container or its layers)
2.67s	Edit an Env Var on the container (forced cold start)
~100ms	All subsequent requests (hot instances)

Ideally, we can also improve the cold start time for subsequent cold starts as well.

[jyecusch]

This hasn't been reported issue in real use schenarios, closing unless it's raised again.