System Monitor Incorrectly Reports CPU

[Brett Holman]

Firefox is currently eating 100% CPU (firefox was nearly unusable, confirmed with htop), however the gnome system monitor reports 0.99%.

This does not appear to be a simple multiplication error since a single process called Isolated Web Co is reported as much higher at 6.31 percent.

See the attached picture which displays process htop alongside gnome system monitor.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: gnome-system-monitor 46.0-1build1
ProcVersionSignature: Ubuntu 6.8.0-31.31-generic 6.8.1
Uname: Linux 6.8.0-31-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.28.1-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Fri May 17 11:35:03 2024
InstallationDate: Installed on 2024-05-02 (15 days ago)
InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Daily amd64 (20240408)
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
SourcePackage: gnome-system-monitor
UpgradeStatus: No upgrade log present (probably fresh install)