Maybe in the previous comment was being overly harsh on myself and
gnome-shell. According to the latest stats, this bug was actually mostly
fixed by:
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/73
which is also in Ubuntu 18.04 and later already.
So let's call this bug closed and
I made a solid attempt at fixing a few related issues,
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/73
but failed to address this bug completely. That said, it does provide a
significant absolute performance improvement to the overview.
I think this bug will be deferred
Looks like a 100% increase (CPU doubles) now that I'm using the trick of
turning off seconds in the panel clock.
** Description changed:
- gnome-shell CPU usage increases about another 60% when in activities
- overview
+ gnome-shell CPU usage doubles when in activities overview
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Here are some realtime profiles showing gnome-shell's CPU going from
11.2% normally to 18.2% when in overview:
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https://bugs.launchpad.net/bugs/1757088
Title:
Activities overview
** Attachment added: "gnome-shell.realtime.overview.pdf"
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1757088/+attachment/5086673/+files/gnome-shell.realtime.overview.pdf
** Description changed:
- gnome-shell CPU usage increases about another 50% when in activities
+
OK it looks like the increase in CPU in activities overview is just
expected. Mutter/Gnome Shell is fairly inefficient to start with so
switching to a mode where it has to render more widgets and more detail
of course incurs higher CPU.
I think a holistic approach is required. Not just fixing
** Attachment added: "gnome-shell.realtime.maximized.pdf"
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1757088/+attachment/5086672/+files/gnome-shell.realtime.maximized.pdf
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Gnome 3.28.0: without the overview
** Attachment added: "gnome-shell.maximized.pdf"
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1757088/+attachment/5085696/+files/gnome-shell.maximized.pdf
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Gnome 3.28.0: with the overview.
** Attachment added: "gnome-shell.overview.pdf"
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1757088/+attachment/5085697/+files/gnome-shell.overview.pdf
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Without the overview.
** Attachment added: "gnome-shell.user-maximized.pdf"
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1757088/+attachment/5085669/+files/gnome-shell.user-maximized.pdf
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With the overview.
** Attachment added: "gnome-shell.user-overview.pdf"
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1757088/+attachment/5085670/+files/gnome-shell.user-overview.pdf
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