Does that happen if you run chromium with the following command:

    chromium-browser --disable-extensions

Also, does that happen on just any page? I.e. try closing everything and
leave just a blank page open, or browse to a very simple static HTML
page such as https://example.org.

** Changed in: chromium-browser (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1844977

Title:
  uses too much cpu in case of inactivity

Status in chromium-browser package in Ubuntu:
  Incomplete

Bug description:
  open any page 
  after few minute fan make noise and between 15 -30% cpu used by chromium 
browser

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: chromium-browser 76.0.3809.100-0ubuntu0.18.04.1
  ProcVersionSignature: Ubuntu 4.15.0-64.73-generic 4.15.18
  Uname: Linux 4.15.0-64-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.7
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  DRM.card0-DP-1:
   enabled: disabled
   dpms: Off
   status: disconnected
   edid-base64: 
   modes:
  DRM.card0-DP-2:
   enabled: disabled
   dpms: Off
   status: disconnected
   edid-base64: 
   modes:
  DRM.card0-DP-3:
   enabled: disabled
   dpms: Off
   status: disconnected
   edid-base64: 
   modes:
  DRM.card0-HDMI-A-1:
   enabled: disabled
   dpms: Off
   status: disconnected
   edid-base64: 
   modes:
  DRM.card0-HDMI-A-2:
   enabled: disabled
   dpms: Off
   status: disconnected
   edid-base64: 
   modes:
  DRM.card0-HDMI-A-3:
   enabled: disabled
   dpms: Off
   status: disconnected
   edid-base64: 
   modes:
  DRM.card0-LVDS-1:
   enabled: enabled
   dpms: On
   status: connected
   edid-base64: 
AP///////wAw5NgCAAAAAAAWAQOAHBB46ohVmVtVjyYdUFQAAAABAQEBAQEBAQEBAQEBAQEBYB1W2FAAGDAwQEcAFZwQAAAbAAAAAAAAAAAAAAAAAAAAAAAAAAAA/gBMRyBEaXNwbGF5CiAgAAAA/gBMUDEyNVdIMi1TTEIzAFk=
   modes: 1366x768
  DRM.card0-VGA-1:
   enabled: enabled
   dpms: On
   status: connected
   edid-base64: 
AP///////wAmzQ5hHgkAACEXAQNoNB14KirFpFZPnigPUFS/7wDRwIGAlQCzAIFAcU+VDwEBAjqAGHE4LUBYLEUACSUhAAAeAAAA/QA3TBhTEQAKICAgICAgAAAA/wAxMTE4N1YzODAyMzM0AAAA/ABQTDI0ODFICiAgICAgAIk=
   modes: 1920x1080 1680x1050 1280x1024 1280x1024 1440x900 1440x900 1280x960 
1152x864 1024x768 1024x768 1024x768 832x624 800x600 800x600 800x600 800x600 
640x480 640x480 640x480 640x480 720x400
  Date: Mon Sep 23 10:29:16 2019
  Desktop-Session:
   'ubuntu'
   '/etc/xdg/xdg-ubuntu:/etc/xdg'
   '/usr/share/ubuntu:/usr/local/share:/usr/share:/var/lib/snapd/desktop'
  DetectedPlugins:
   
  Env:
   'None'
   'None'
  InstallationDate: Installed on 2018-10-24 (333 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  Load-Avg-1min: 1.01
  Load-Processes-Running-Percent:   0.1%
  MachineType: LENOVO 23259S9
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-64-generic 
root=UUID=68f6aa88-4dcb-4bb8-ab84-312e7bd2b5ba ro quiet splash vt.handoff=1
  SourcePackage: chromium-browser
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/20/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G2ET90WW (2.50 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 23259S9
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvrG2ET90WW(2.50):bd12/20/2012:svnLENOVO:pn23259S9:pvrThinkPadX230:rvnLENOVO:rn23259S9:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.family: ThinkPad X230
  dmi.product.name: 23259S9
  dmi.product.version: ThinkPad X230
  dmi.sys.vendor: LENOVO
  modified.conffile..etc.default.chromium-browser: [deleted]

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