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This is talking about Firecracker[0] which is for microvm deployments so I would think it is the aggregate effect of losing that 7% across a large number of spin-ups that would make a difference. Occasional reboot on your personal machines obviously doesn't make a dent.

[0]: https://firecracker-microvm.github.io/

The lower the boot time, the more aggressively you can also afford to shut them down when not in use, freeing up capacity.

I'd imagine if you wanted absolute boot time you'd just use a container

Containers are inappropriate for many workloads, such as any workload that relies on multitenancy.

This is for FreeBSD Firecracker. This means this is used for AWS Lambda and Fargate. A whole bunch of 2ms wins is how one would improve cold start time.

I wanted to figure out the cost to all users.

BSD is sometimes used in some iot-like devices, of which there are 3 billion. If I randomly assume 0.5% of those are running a fork of FreeBSD, that's 15 million devices. I'm also going to randomly assume that devices reboot once a month on average.

That all comes out to 4.2 days/year saved! Wow!

https://www.wolframalpha.com/input/?i=2ms+*+3+billion+*+0.5%...