/usr/share/gnome-shell/perf-background.xml is in gnome-shell-common 3.18.4-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | <!-- With an animated background, performance will differ depending on whether
one layer or two layers are being blended together. This messes up our
benchmarks. We could just benchmark a single image, but since blended
images are present for much of the day with the GNOME default background,
we want to make sure that also performs well; for that reason we ship
an "animated" background that animates super-slowly to use during
performance tests; it will be in the blended state until 2030. -->
<background>
<starttime>
<year>1990</year>
<month>1</month>
<day>1</day>
<hour>0</hour>
<minute>00</minute>
<second>00</second>
</starttime>
<!-- One transition that takes 40 years -->
<transition type="overlay">
<duration>1261440000.0</duration>
<from>/usr/share/backgrounds/gnome/adwaita-morning.jpg</from>
<to>/usr/share/backgrounds/gnome/adwaita-day.jpg</to>
</transition>
<!-- A single slide doesn't work, so another slide for 1 minute after 40 years -->
<static>
<duration>60</duration>
<file>/usr/share/backgrounds/gnome/Sandstone.jpg</file>
</static>
</background>
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