Public bug reported:

Mutter is hanging for multiple seconds (5 or so) at random times, especially 
when your user session starts and you open new applications from the launcher:
- the screen freeze (apps & Shell) completely
- you have a second cursor that you can move and refresh during that period

It seems that disabling drm nvidia support prevent the issue from
happening so far. More update if it's not the case anymore.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: mutter 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 nvidia_modeset 
nvidia
ApportVersion: 2.20.10-0ubuntu23
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Apr  5 10:21:09 2019
InstallationDate: Installed on 2018-05-24 (315 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: mutter
UpgradeStatus: Upgraded to disco on 2019-01-08 (86 days ago)

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


** Tags: amd64 apport-bug disco nvidia performance

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https://bugs.launchpad.net/bugs/1823301

Title:
  [nvidia] Shell hangs up at random times when using nvidia-
  drm.modeset=1

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