On: New for AWS Lambda: Use Any Programming Language a...

[nostrebored]

That's not for in-VPC functions, although if the underlying instance changes with firecracker migration users might see ENI start improvements. Currently your ENI usage is roughly floor(3GB/Memory Allocation)*(Concurrent Executions). If the 3GB changes users will see huge gains as each ENI creation can take around 9s.

[k__ → nostrebored]

Why would you use VPC functions?

[Wintereise → k__]

Mostly due to being forced. For example: serverless aurora forces a VPC on you.

With delays as bad as 8+ seconds for ENI attachment, this is a significant holdback (https://medium.freecodecamp.org/lambda-vpc-cold-starts-a-lat...)

[zwily → Wintereise]

I believe you can now use Aurora Serverless outside of a VPC by using the new Data API endpoint.

[Wintereise → zwily]

You indeed can, but it's beta (us-east-1 only at the moment) and leaves a lot to be desired (https://www.jeremydaly.com/aurora-serverless-data-api-a-firs...)

[k__ → Wintereise]

Ah okay, I never thought about using an SQL DB.

[jvanvleet → nostrebored]

True. In-VPC has extra costs.