Its fixed with current updates and gnome 40:
$ apt policy gnome-shell
gnome-shell:
Installed: 40.2-1ubuntu1
Candidate: 40.2-1ubuntu1
Version table:
*** 40.2-1ubuntu1 500
500 http://us.archive.ubuntu.com/ubuntu impish/main amd64 Packages
100 /var/lib/dpkg/status
No more slow dock icons!
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https://bugs.launchpad.net/bugs/1900907
Title:
20.04 Slow icons in dock
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