Public bug reported:

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

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)

** Affects: gdm3 (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug disco

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  very long delay to display login prompt if there are a large number of
  uncleared desktop notifications

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