Dock appears blank, then lags (for some accounts)

[Krister Swenson]

I just upgraded to 20.04 beta.
For one of my user accounts, the Dock shows up blank (see 1 in the attached image). The Dock then seems to be laggy.

These are the strange things that I see when taking 3 screenshots (labeled in the attached .png):

0. Boot the machine and log on.
1. The Dock is empty and clicking on the "Show Applications" icon does nothing.
2. After taking the screenshot showing (1), the icons in the Dock appear but the screenshot application icon is missing.
3. After taking a second screenshot we see the screenshot application icon.
4. (not depicted in the PNG) After closing the screenshot application, that icon lags in the application bar for a while.
5. The "Show Applications" icon now works.

The Dock is also set on autohide and will not appear unless a window is moved out of the way. I'm not sure if this is related. Will file another report for that problem.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome (not installed)
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.11-0ubuntu22
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Apr 2 14:52:56 2020
InstallationDate: Installed on 2015-09-30 (1645 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
SourcePackage: meta-gnome3
UpgradeStatus: Upgraded to focal on 2020-04-02 (0 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Ari Birnbaum (ceiphr)]

Similar situation. On Ubuntu Wayland. Using the normal Ubuntu dock, icons will disappear when browsing the web. Then, GNOME's performance becomes very poor. Constant lag, as if my DE is running at 5-10 FPS. Unusable until I logout/in again to restart the session.

Ubuntu 20.10. Dell XPS 7590.