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While I share the sentiment (and have been noodling with similar projects), unfortunately the minimum is around 4 seconds as the VideoCore chip is what boots first, then after about 4 seconds hands things over to the ARM chip, which can effectively boot instantly with this sort of OS.

Is that 4sec delay something introduce in the pi 4 or 5? At least one guy got the 3 to boot to a Qt app in 2.8 seconds: https://www.furkantokac.com/rpi3-fast-boot-less-than-2-secon...

I've seen it with a 3 as well. That method, among other things, loses USB keyboard and mouse support. I haven't gone down that extreme a path yet...

It’s written for the i386 CPU architecture while Raspberry Pi is ARM, so it would need to be ported.

What about Haiku OS? It’s supposed to be for that exact use case…

I don't think Haiku runs on raspberry pi either.

Have you checked out RISC OS already?