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I can get it down to 1ms, so there's probably something wrong with my setup. (I just look for how the cursor moves; on the delayed one, I can discern the presence of the cursor on the next line for a split second.) Maybe monitor refresh rate, or the minimal resolution sleep can handle?

I'm using Alacritty, which is supposed to be really fast and everything!

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Likely forking sleep takes time.

I would be extremely surprised if fork on a unix-like takes 1ms.

Be horrified, then. https://redislabs.com/blog/testing-fork-time-on-awsxen-infra... https://www.cs.indiana.edu/~adkulkar/papers/pspawn.pdf

Both of those appear to indicate that forking is expensive when you need to copy unusually large amounts of memory (which makes sense). In this context, I would expect reasonable/small memory use and so fast forking.

From lmbench, http://www.bitmover.com/lmbench/lat_proc.8.html

Try it out.

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