I never had a fast NVME SSD so my devices boot significantly slower than yours but unless you are actually at the point of instant booting it's about half the boot time for me. I only use OpenRC on my Pinephone because it's the default for PostmarketOS (a Alpine based OS for mobile phones) and never found a good enough reason to use it on my actual computer but it's quite a bit faster and also quite a bit less convinient so all in all probably not worth it but still impressive to watch!