Gnome display manager (gdm3) takes 10 seconds to show login screen after blank screen

Hello everybody

at first I’m new to Linux world

I’m using debian buster 4 months ago with gnome desktop environment along side with windows 10 and everything was awesome.

after updates(as i remember) gnome startup became slower than before ( its takes about 10 seconds to show gnome login screen and another 5-7 seconds to show desktop after pressing login button).

after gnome startup i don’t have any problem and apps is running normally, the problem is only on startup.

trying to fix the problem:

1- i reinstalled the whole system many times and nothing changes.
2- i tried another operating systems with gnome like linux mint , manjaro linux and ubuntu and the same problem happens .
3- i disabled extensions and nothing changes.

does UEFI insecure boot has limitation that affect performance ?

does new gnome get more heavy than before ?

**Info **:

laptop : Dell Vostro

CPU : Intel® Core™ i7-7500U CPU @ 2.70GHz


UEFI : secure boot is off

uname -a command : Linux user-pc 4.19.0-8-amd64 #1 SMP Debian 4.19.98-1 (2020-01-26) x86_64 GNU/Linux

linux kernel version : 4.19.0-8-amd64

system-analyze output :
Startup finished in 17.004s (firmware) + 47.993s (loader) + 9.076s (kernel) + 36.720s (userspace) = 1min 50.795s reached after 36.713s in userspace

system-analyze blame:

     23.954s plymouth-quit-wait.service
      4.304s dev-sda7.device
      2.913s udisks2.service
      2.770s NetworkManager.service
      2.418s accounts-daemon.service
      1.886s systemd-fsckdev-disk-by\x2duuid-64B0\x2dD441.service
      1.768s apparmor.service
      1.588s systemd-tmpfiles-setup.service
      1.447s fwupd.service
      1.153s systemd-backlightbacklight:intel_backlight.service
      1.098s avahi-daemon.service
      1.086s switcheroo-control.service
      1.085s systemd-logind.service
      1.071s wpa_supplicant.service
      1.059s rsyslog.service
       888ms upower.service
       858ms gdm.service
       779ms pppd-dns.service
       773ms alsa-restore.service
       600ms polkit.service
       545ms console-setup.service
       483ms systemd-rfkill.service
       419ms systemd-backlightleds:dell::kbd_backlight.service

systemd-analyze critical-chain gdm3.service:

gdm.service +858ms
└─systemd-user-sessions.service at 12.719s +36ms
└─ @12.711s
└─NetworkManager.service at 9.939s +2.770s
└─dbus.service at 9.910s
└─ at 9.895s
└─ at 9.895s
└─uuidd.socket at 9.895s
└─ at 9.894s
└─systemd-timesyncd.service at 9.562s +331ms
└─systemd-tmpfiles-setup.service at 7.912s +1.588s
└─ at 7.907s
└─boot-efi.mount at 7.690s +215ms
└─systemd-fsck at dev-disk-by\x2duuid-64B0\x2dD441.service
└─dev-disk-by\x2duuid-64B0\x2dD441.device at 5.760s

i dont know how to know what causes that latency :confused: ?

thank you all
best regards.

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