hi all i am running elementary os 0.4.1 loki on dell inspiron 1525 with intel core duo processor 3 gb ram ,but the problem is it takes 2.25 min to start up (boot) when i run systemd-analyze blame it shows the following outcome

12.392s lightdm.service
          6.320s dev-sda2.device
          5.691s plymouth-quit-wait.service
          5.315s NetworkManager-wait-online.service
          4.404s systemd-tmpfiles-setup-dev.service
          1.760s NetworkManager.service
          1.550s accounts-daemon.service
          1.393s alsa-restore.service
          1.330s keyboard-setup.service
          1.225s thermald.service
          1.175s systemd-modules-load.service
          1.052s iio-sensor-proxy.service
          1.038s grub-common.service
          1.017s apparmor.service
           963ms resolvconf.service
           949ms systemd-sysctl.service
           817ms gpu-manager.service
           668ms systemd-journald.service
           662ms sys-kernel-debug.mount
           659ms dev-hugepages.mount
           641ms packagekit.service
           636ms dev-mqueue.mount
           571ms ufw.service
           517ms irqbalance.service
           517ms apport.service
           474ms systemd-logind.service
           451ms colord.service
           441ms systemd-user-sessions.service
           402ms avahi-daemon.service
           382ms upower.service
           378ms console-setup.service
           325ms pantheon-parental-controls.service
           277ms polkitd.service
           274ms kmod-static-nodes.service
           268ms networking.service
           203ms systemd-tmpfiles-setup.service
           193ms systemd-timesyncd.service
           183ms systemd-backlight@backlight:acpi_video0.service
           171ms systemd-update-utmp.service
           130ms udisks2.service
           128ms systemd-udev-trigger.service
           125ms systemd-journal-flush.service
           108ms systemd-udevd.service
            94ms setvtrgb.service
            91ms systemd-tmpfiles-clean.service
            58ms ondemand.service

thanks for your help and cooperation :)

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