Provisioned concurrency isn't worth it in my experience. You can just use, say, a CloudWatch rule to ping your desired number of instances every 5-odd minutes a

Provisioned concurrency isn't worth it in my experience. You can just use, say, a CloudWatch rule to ping your desired number of instances every 5-odd minutes and keep them warm. 288 pings per day for 100 instances at 100ms per instance/ping is 2,880 seconds of execution time, or 5,760 GB-seconds at 2GB RAM (1 full vCPU and a bit). At $0.0000166667 per GB-second, that's $35 a year. You could cut that in half with smarter pings than e.g. [1], but it's not worth the engineering cycles at this price. 1. Python version: https://github.com/robhowley/lambda-warmer-py https://github.com/robhowley/lambda-warmer-py