I found the problem. Your system only has one GPU (GeForce 9600) which
it needs the 'nouveau' driver to use. But you have disabled the
'nouveau' driver in your kernel command line:
nouveau.modeset=0
and so gnome-shell is using software rendering, hence high CPU. So this
is not a bug.
Please remove that option from your kernel command line
(/etc/default/grub) then run:
sudo update-grub
and reboot.
Separately, I suggest you will get much better performance using the
proprietary Nvidia driver. It seems your GPU requires Nvidia driver
version 340. To install that please open the 'Additional Drivers' app.
** Changed in: gnome-shell (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1889377
Title:
gnome-shell using lot of CPU (costantly 30% - often up to 100%) making
my system quite slow
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