Curious if they have spikey latency from cold starts? The authorization calls have a time budget but it's pretty generous so maybe a nothing-burger there? How d

Curious if they have spikey latency from cold starts? The authorization calls have a time budget but it's pretty generous so maybe a nothing-burger there? How do they keep authorization context fresh enough for the lambda performing it? Also... what has the bill been like? I've used Lambda for side-car data migration projects but I'd be surprised if it saved money over a beefy co-located or cloud server if your volume is generally constant.