[Bug 100617] [ILK][Regression bisected] Gnome Shell slow animations

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100617

--- Comment #7 from groucho <grouchomarx.fr at gmail.com> ---
In case it is relevant, I also made some tests with gnome shell perf tool.

Here are the results before the commit:

# Frames rate when going to the overview, 10 alpha-transparent windows open
overviewFps10Alpha 57.1958508496
# Frames rate when going to the overview, 10 maximized windows open
overviewFps10Maximized 55.6326022944
# Frames rate when going to the overview, 10 windows open
overviewFps10Windows 57.4456144692
# Frames rate when going to the overview, 5 alpha-transparent windows open
overviewFps5Alpha 59.5006703742
# Frames rate when going to the overview, 5 maximized windows open
overviewFps5Maximized 63.1220148547
# Frames rate when going to the overview, 5 windows open
overviewFps5Windows 59.9046318261
# Frame rate when going to the overview, first time
overviewFpsFirst 60.7995136039
# Frames rate when going to the overview, second time
overviewFpsSubsequent 61.0242306879


And these are the results after:

# Frames rate when going to the overview, 10 alpha-transparent windows open
overviewFps10Alpha 23.271418431739114
# Frames rate when going to the overview, 10 maximized windows open
overviewFps10Maximized 24.078399268016664
# Frames rate when going to the overview, 10 windows open
overviewFps10Windows 23.188853890896443
# Frames rate when going to the overview, 5 alpha-transparent windows open
overviewFps5Alpha 28.9440387684725
# Frames rate when going to the overview, 5 maximized windows open
overviewFps5Maximized 29.45074363127669
# Frames rate when going to the overview, 5 windows open
overviewFps5Windows 30.20155764533556
# Frame rate when going to the overview, first time
overviewFpsFirst 33.18856796070474
# Frames rate when going to the overview, second time
overviewFpsSubsequent 36.14858514437745



Although 30fps may sound good, Gnome often has performance hits and animations
drop below 15fps.
It feels really slow compared to the previous situation : Gnome was dropping
from 60fps to ~30fps.


I also want to correct my comment 4 about Wayland, it was not 60fps with a
single Window. The animations look the same as Xorg.

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