% systemd-analyze critical-chain
The time after the unit is active or started is printed after the "@" character.
The time the unit takes to start is printed after the "+" character.

multi-user.target @3.003s
└─postgresql.service @3.002s +885us
  └─postgresql@9.6-main.service @784ms +2.217s
    └─basic.target @783ms
      └─sockets.target @782ms
        └─snapd.socket @781ms +1ms
          └─sysinit.target @780ms
            └─systemd-timesyncd.service @641ms +138ms
              └─systemd-tmpfiles-setup.service @626ms +11ms
                └─local-fs.target @624ms
                  └─boot.mount @619ms +4ms
                    └─systemd-fsck@dev-disk-by\x2duuid-7de922ba\x2d072b\x2d4729\x2dbe99\x2deeeab6ebd3a5.service @603ms +15ms
                      └─dev-disk-by\x2duuid-7de922ba\x2d072b\x2d4729\x2dbe99\x2deeeab6ebd3a5.device @602ms