Comment 4 for bug 1821462

also my case:

         21.939s plymouth-quit-wait.service
         13.357s NetworkManager-wait-online.service
          3.952s user@1000.service
          1.759s dev-sdb2.device
          1.495s plymouth-read-write.service
          1.035s snapd.service
           789ms dev-loop1.device
           747ms dev-loop2.device
           706ms dev-loop9.device
           703ms dev-loop3.device
           673ms dev-loop8.device
           670ms dev-loop4.device
           642ms dev-loop5.device
           635ms dev-loop6.device
           613ms dev-loop7.device
           605ms dev-loop10.device
           596ms snap-gnome\x2dcalculator-406.mount
           592ms snap-core-6818.mount
           590ms snap-gnome\x2dcharacters-254.mount
           588ms snap-gnome\x2d3\x2d28\x2d1804-31.mount
           522ms systemd-logind.service
           487ms udisks2.service
           484ms fwupd.service
           467ms dev-loop11.device
           419ms networkd-dispatcher.service
           347ms dev-loop0.device
           332ms ModemManager.service
           312ms snap-gnome\x2dsystem\x2dmonitor-77.mount
           303ms snap-gnome\x2dlogs-61.mount
           298ms snap-gtk\x2dcommon\x2dthemes-1198.mount
           293ms snap-gnome\x2dsystem\x2dmonitor-81.mount
           283ms snap-gnome\x2dcharacters-258.mount
           268ms accounts-daemon.service
           218ms systemd-rfkill.service
           203ms snap-core18-941.mount
           190ms upower.service
           178ms snap-core-6673.mount
           172ms NetworkManager.service
           167ms systemd-resolved.service
           161ms systemd-udev-trigger.service
           160ms thermald.service
           154ms grub-common.service
           154ms snap-gnome\x2d3\x2d28\x2d1804-40.mount
           149ms apparmor.service
           133ms avahi-daemon.service
           121ms systemd-timesyncd.service
           113ms systemd-journal-flush.service
           111ms apport.service
           104ms pppd-dns.service
           102ms systemd-backlight@backlight:intel_backlight.service
           102ms switcheroo-control.service
           101ms systemd-backlight@leds:asus::kbd_backlight.service
            96ms gdm.service
            94ms polkit.service
            90ms gpu-manager.service
            87ms bluetooth.service
            86ms wpa_supplicant.service
            83ms systemd-fsck@dev-disk-by\x2duuid-b550cb95\x2d3485\x2d4705\x2d8e99\x2d35d4a8597e15.service
            83ms systemd-journald.service
            83ms keyboard-setup.service
            75ms rsyslog.service
            75ms systemd-fsck@dev-disk-by\x2duuid-AA4F\x2dB4F9.service
            73ms packagekit.service
            71ms systemd-udevd.service
            44ms plymouth-start.service
            40ms systemd-tmpfiles-setup.service
            37ms dev-disk-by\x2duuid-4c770753\x2dfa86\x2d42f1\x2dad92\x2d2c4ea669c27e.swap
            32ms networking.service
            31ms bolt.service
            29ms systemd-modules-load.service
            25ms snapd.seeded.service
            23ms kerneloops.service
            20ms console-setup.service
            20ms systemd-sysctl.service
            19ms boot-efi.mount
            19ms home.mount
            18ms systemd-update-utmp-runlevel.service
            17ms systemd-sysusers.service
            16ms dns-clean.service
            16ms ifupdown-pre.service
            15ms systemd-remount-fs.service
            15ms systemd-user-sessions.service
            15ms systemd-update-utmp.service
            14ms ufw.service
            13ms user-runtime-dir@1000.service
            13ms dev-mqueue.mount
            12ms sys-kernel-debug.mount
            12ms colord.service
            12ms systemd-random-seed.service
            11ms kmod-static-nodes.service
            11ms systemd-tmpfiles-setup-dev.service
             9ms rtkit-daemon.service
             8ms grub-initrd-fallback.service
             8ms sys-fs-fuse-connections.mount
             8ms sys-kernel-config.mount
             7ms dev-hugepages.mount
             7ms setvtrgb.service
             6ms openvpn.service
           553us snapd.socket