Boot hangs for potentially long periods

This seems to happen after the `[   0.017325] MYTHRIL-INFO: INITRD_SIZE: 0x6cd600` output, even if the initramfs is very small. It may be worse on machines with low core count, but that's less clear. I'd at least like to track down what's going on during this time and maybe put a log message there so it's clear what we're waiting on.