This sounds similar to bug 1883456... Please:
1. Try opening the 'Extensions' app and disable 'Ubuntu AppIndicators'.
Does that fix it?
2. Run 'top' and tell us if any process is using high CPU.
3. Run the following commands after you have experienced the issue:
journalctl -b0 > journal.txt
gsettings list-recursively org.gnome.shell > settings.txt
and attach the resulting text files here.
** Package changed: xorg (Ubuntu) => gnome-shell (Ubuntu)
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1890001
Title:
Random stuttering while in game
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