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Sorry, I am a bit confused about the caching delay, which seems to suggest you can switch kernels without rebooting? That's not what the wiki suggests[0], and what even happens to running programs?

Or do you mean just changing the "default" boot to a different kernel, which in other distros would require changing the boot loader config?

[0] https://nixos.wiki/wiki/Linux_kernel

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If memory serves the cachyos-nix flakes sets a cache for pre-built kernels, but that cache isn't available until you rebuild. So if you want to use the cache you need to do two steps, add cachyos to your inputs, rebuild, switch the kernel, rebuild.

Then reboot to use the new kernel.

Correct, I should've worded that better for more clarity.

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