Sure, but there are no actionable metrics re. response time.

The closest is a suggestion from prior documentation[1] that Lambda "can scale by an additional 500 instances each minute" for a given function, but that's phrased like a promotional claim, not a commitment or even an objective, and it's even unclear whether that's a floor, a ceiling, or some average measure. I wouldn't doubt that PC lives on the same control plane as Lambda's regular scaling, but assuming identical behaviour is unwise unless documented.

Guess I can suck-it-and-see.

[1] https://docs.aws.amazon.com/lambda/latest/dg/scaling.html