Date: 2018jul24 OS: Linux Q. Linux: Where does the time go when my system boots? A. If your distro is systemd-based (most are now) you can do:

systemd-analyze blame

Example output:

4.461s dovecot.service 2.724s dracut-initqueue.service 756ms upower.service 639ms udisks2.service 637ms mariadb.service 552ms postfix.service 486ms dnf-makecache.service 483ms lvm2-monitor.service 417ms initrd-switch-root.service 415ms systemd-udev-settle.service 364ms unbound-anchor.service 350ms ModemManager.service 329ms firewalld.service 316ms dev-sda1.device 253ms chronyd.service 245ms lm_sensors.service 241ms avahi-daemon.service 233ms rtkit-daemon.service 205ms plymouth-quit.service

It has lots of other cool options, like graphing, see the man page