Fedora 28中的慢速启动

Question

我目前正在使用fedora28。加载时间很长，我想减少它，但是我不知道怎么做。

[hostname@localhost] $ 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.

graphical.target @2min 30.891s
└─multi-user.target @2min 30.890s
  └─libvirtd.service @50.883s +11.513s
    └─remote-fs.target @50.845s
      └─remote-fs-pre.target @50.845s
        └─iscsi-shutdown.service @50.843s
          └─network.target @50.761s
            └─wpa_supplicant.service @56.240s +3.138s
              └─dbus.service @21.360s
                └─basic.target @21.246s
                  └─sockets.target @21.246s
                    └─cups.socket @21.246s
                      └─sysinit.target @21.190s
                        └─systemd-update-utmp.service @21.120s +69ms
                          └─auditd.service @20.539s +577ms
                            └─systemd-tmpfiles-setup.service @20.040s +457ms
                              └─fedora-import-state.service @19.685s +354ms
                                └─local-fs.target @19.679s
                                  └─run-user-42.mount @59.008s
                                    └─local-fs-pre.target @17.612s
                                      └─lvm2-monitor.service @5.303s +12.308s
                                        └─lvm2-lvmetad.service @17.027s
                                          └─lvm2-lvmetad.socket @5.263s
                                            └─-.mount
                                              └─system.slice
                                                └─-.slice

欢迎一些减少启动时间的简单命令