I have fond memories of OS/2, but I wonder if it still takes 5 minutes to boot... that was definitely the nadir for personal computer boot time. I imagine SSD helps a lot though.
9 Started out as < 1 sec on Apple II, got worse and worse - PC BIOS, SCSI cards, Windows, and then OS/2 good lord. Since then it's been getting faster and finally back to < 10 sec from cold boot with Win10. Except CentOS. Debian boots right up, but CentOS is still a f@#$ing pig that spends minutes doing god knows what. )