Viele dev-ttySxy.devices verlängern Bootzeit ?

 4.429s dev-ttyS20.device
 4.429s sys-devices-platform-serial8250-tty-ttyS20.device
 4.425s sys-devices-platform-serial8250-tty-ttyS21.device
 4.425s dev-ttyS21.device
 4.422s dev-ttyS13.device
 4.422s sys-devices-platform-serial8250-tty-ttyS13.device
 4.422s sys-devices-platform-serial8250-tty-ttyS19.device
 4.422s dev-ttyS19.device
 4.420s dev-ttyS16.device
 4.420s sys-devices-platform-serial8250-tty-ttyS16.device
 4.406s dev-ttyS17.device
 4.406s sys-devices-platform-serial8250-tty-ttyS17.device
 4.400s sys-devices-platform-serial8250-tty-ttyS15.device
 4.400s dev-ttyS15.device
 4.400s sys-devices-platform-serial8250-tty-ttyS18.device
 4.400s dev-ttyS18.device
 4.396s dev-ttyS24.device
 4.396s sys-devices-platform-serial8250-tty-ttyS24.device
 4.391s sys-devices-platform-serial8250-tty-ttyS26.device
 4.391s dev-ttyS26.device
 4.390s dev-ttyS25.device

luigi@E520-Biene:~> systemd-analyze blame | grep -v dev

4.095s NetworkManager-wait-online.service

1.947s dracut-initqueue.service
1.260s postfix.service
1.049s firewalld.service
797ms initrd-switch-root.service
797ms display-manager.service
787ms snapd.service
347ms augenrules.service
322ms kbdsettings.service
314ms chronyd.service
277ms apparmor.service
275ms plymouth-quit-wait.service
268ms systemd-logind.service
259ms ModemManager.service
248ms user@1000.service
243ms sound-extra.service
242ms initrd-parse-etc.service
141ms sshd.service
135ms udisks2.service
124ms smartd.service
124ms avahi-daemon.service
121ms wpa_supplicant.service
119ms alsa-restore.service
108ms polkit.service
105ms auditd.service
100ms lvm2-monitor.service
 95ms upower.service
 93ms systemd-backlight@backlight:intel_backlight.service
 91ms systemd-journal-flush.service
 91ms issue-generator.service
 82ms dracut-cmdline.service
 77ms systemd-vconsole-setup.service
 69ms snap-core18-2796.mount
 68ms klog.service
 68ms snapd.apparmor.service
 67ms NetworkManager.service
 67ms plymouth-start.service
 60ms snap-snapd-20290.mount
 59ms snap-core18-2812.mount
 54ms snap-zerotier-192.mount
 53ms plymouth-switch-root.service
 50ms systemd-journald.service
 50ms snap-snapd-20092.mount
 49ms rtkit-daemon.service
 47ms nscd.service
 47ms mcelog.service
 47ms systemd-remount-fs.service
 46ms systemd-tmpfiles-setup.service
 45ms rsyslog.service
 35ms systemd-random-seed.service
 34ms systemd-sysctl.service
 34ms sys-kernel-debug.mount
 34ms home.mount
 34ms systemd-modules-load.service
 34ms modprobe@fuse.service
 32ms sys-kernel-tracing.mount
 29ms kmod-static-nodes.service
 27ms initrd-cleanup.service
 26ms boot-sysctl.service
 26ms systemd-fsck-root.service
 25ms iscsi.service
 25ms modprobe@configfs.service
 24ms modprobe@drm.service
 23ms plymouth-read-write.service
 18ms user-runtime-dir@1000.service
 13ms dracut-shutdown.service
 12ms systemd-update-utmp.service
  9ms systemd-update-utmp-runlevel.service
  9ms proc-sys-fs-binfmt_misc.mount
  8ms sys-fs-fuse-connections.mount
  8ms sys-kernel-config.mount
  8ms systemd-backlight@backlight:acpi_video0.service
  6ms systemd-user-sessions.service
  1ms snapd.socket
ludwig@E520-Biene:~>

luigi@E520-Biene:~> systemd-analyze critical-chain
The time when unit became active or started is printed after the "@" character.
The time the unit took to start is printed after the "+" character.

graphical.target @8.522s
└─display-manager.service @7.724s +797ms
  └─systemd-user-sessions.service @7.715s +6ms
    └─remote-fs.target @7.712s
      └─iscsi.service @7.683s +25ms
        └─network-online.target @7.681s
          └─NetworkManager-wait-online.service @3.584s +4.095s
            └─NetworkManager.service @3.513s +67ms
              └─network-pre.target @3.511s
                └─wpa_supplicant.service @4.641s +121ms
                  └─dbus.service @2.281s
                    └─basic.target @2.223s
                      └─sockets.target @2.223s
                        └─snapd.socket @2.221s +1ms
                          └─sysinit.target @2.202s
                            └─systemd-backlight@backlight:acpi_video0.service @5.897s +8ms
                              └─system-systemd\x2dbacklight.slice @1.223s
                                └─system.slice
                                  └─-.slice