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I don't think it's about getting 1ms execution time: It's more like having 300ms vs 301ms execution time be very similar in cost (or however the rounding worked).

The firecracker microvm says startup time is under 125ms, but I have not personally done any benchmarking, though my employer does use firecracker for hosting our CI builders.

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Ah yeah makes sense. Really interesting that cf workers limit you to 50ms cpu time rather than wallclock time, makes lots of send-then-wait scenarios possible/way cheaper.

actually there appears to be a limit to this. i’ve never been able to perform more than ~50 http requests per invocation, leading me to believe that they are “billed” with 1ms cpu time.

Yeah it’s not _just_ 50ms cpu, there are other constraints like 50 sub requests, 6 open connections etc.

Still faaairly generous, good luck getting 50 sub requests done in 50ms if you had to measure against wallclock =)

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