I'm on Debian Buster, seeing the same behaviour (i.e. long timeout before being 
shown the login screen in GDM3). Before the upgrade from Stretch all worked as 
expected.
Uninstalling fprintd and libpam-fprintd solves the issue. But I like to have 
the fingerprint reader working ;-) This is on a Lenovo T430 laptop, fingerprint 
reader ID 147e:2020 Upek TouchChip Fingerprint Coprocessor.

So, I now downgraded both of those packages to version 0.8.0-2, and all works 
fine.
Note, I did not change the installed version of libfprint0, currently this is 
0.8.2-3.
Installed version of systemd is 241-7~deb10u1.

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You received this bug notification because you are a member of Desktop
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https://bugs.launchpad.net/bugs/1824855

Title:
  Unlocking the screen takes a long time after "Starting Fingerprint
  Authentication Daemon..."

Status in fprintd package in Ubuntu:
  Confirmed
Status in gnome-shell package in Ubuntu:
  Confirmed
Status in fprintd package in Fedora:
  Confirmed

Bug description:
  When waking my laptop screen up at the lock screen, it takes a very
  long time to display the password prompt (definitely longer than 30s,
  possibly longer than 1m - I didn't time it).  I notice that while
  waiting for the password prompt, the screen is showing a full list of
  (obfuscated) desktop notifications.  After logging in, I used the
  gnome-shell interface to clear the notifications; then I locked my
  screen again, at which point hitting the space bar caused the password
  prompt to show up immediately.

  So it looks like the time to display the password prompt might scale
  linearly with the number of notifications; which is not useful,
  because there is a finite number of (obfuscated!) notifications that
  will be displayed on the lock screen, and AFAIK you can't interact
  with them through the lock screen at all.  So we shouldn't be wasting
  time processing (and presumably rendering) notifications that will
  never be visible.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: gdm3 3.32.0-1ubuntu1
  ProcVersionSignature: Ubuntu 5.0.0-8.9-generic 5.0.1
  Uname: Linux 5.0.0-8-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu27
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Apr 15 09:58:23 2019
  InstallationDate: Installed on 2010-09-24 (3125 days ago)
  InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 
(20100816.1)
  SourcePackage: gdm3
  UpgradeStatus: Upgraded to disco on 2019-04-11 (3 days ago)

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