One more piece of information from the syslog:
dec 05 21:22:03 mobileaeris kernel: CPU0: Core temperature above threshold, cpu 
clock throttled (total events = 1)
dec 05 21:22:03 mobileaeris kernel: CPU2: Core temperature above threshold, cpu 
clock throttled (total events = 1)
dec 05 21:22:03 mobileaeris kernel: CPU1: Package temperature above threshold, 
cpu clock throttled (total events = 1)
dec 05 21:22:03 mobileaeris kernel: CPU3: Package temperature above threshold, 
cpu clock throttled (total events = 1)
dec 05 21:22:03 mobileaeris kernel: CPU2: Package temperature above threshold, 
cpu clock throttled (total events = 1)
dec 05 21:22:03 mobileaeris kernel: CPU0: Package temperature above threshold, 
cpu clock throttled (total events = 1)
dec 05 21:22:03 mobileaeris kernel: CPU0: Core temperature/speed normal
dec 05 21:22:03 mobileaeris kernel: CPU1: Package temperature/speed normal
dec 05 21:22:03 mobileaeris kernel: CPU2: Core temperature/speed normal
dec 05 21:22:03 mobileaeris kernel: CPU3: Package temperature/speed normal
dec 05 21:22:03 mobileaeris kernel: CPU2: Package temperature/speed normal
dec 05 21:22:03 mobileaeris kernel: CPU0: Package temperature/speed normal

This did happen before (with 18.04) and may be completely unrelated -
it's just the normal consequence of running a graphics-intensive
application. But it also may be the actual trigger... So the problem may
be somewhere between Gnome, kernel and nvidia-driver...

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1807096

Title:
  [nvidia] gnome-shell uses 100% cpu, triggered by games while using
  nvidia-driver

Status in gnome-shell package in Ubuntu:
  Incomplete

Bug description:
  There's not much I can provide in terms of hard data, but maybe
  someone can help with getting to the bottom of this. After installing
  Ubuntu 18.10, I'm unable to use graphics-intensive games.

  My setup:
  ASUS F556U, with Intel® Core™ i7-7500U CPU @ 2.70GHz × 4, Intel® HD Graphics 
620 (Kaby Lake GT2) + NVIDIA GeForce 940MX.

  While the Nvidia card is being used (Performance mode set in nvidia-
  settings) and I run a 3d game with Steam (happens e.g. with Black
  Mesa, Euro Truck Simulator 2...), everything works as expected, but
  after a relatively short amount of time gnome-shell starts eating up
  more and more CPU for some reason, effectively taking over the actual
  game. The game starts to stutter first, then slowly grinds to a
  completely unresponsive state. If I manage to quit the game, gnome-
  shell still does its thing. I'm sometimes even unable to enter the
  overview mode in Gnome. The only solution is to reboot.

  This does happen with nvidia-driver-390 from the standard repo, but
  also with nvidia-driver-410 from the graphics PPA. This was not the
  issue with Ubuntu 18.04. It also does not happen with nouveau, or with
  the Intel drivers (power saving mode in nvidia-settings). There's also
  nothing of note in the syslog.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: gnome-shell 3.30.1-2ubuntu1
  ProcVersionSignature: Ubuntu 4.18.0-12.13-generic 4.18.17
  Uname: Linux 4.18.0-12-generic x86_64
  ApportVersion: 2.20.10-0ubuntu13.1
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Dec  6 07:26:04 2018
  DisplayManager: gdm3
  InstallationDate: Installed on 2018-12-05 (0 days ago)
  InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 
(20181017.3)
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=sk_SK.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)

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