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The VNC server and/or the spice agent would need to export the fact that their
display is being used from a slow location, or just through the network
(whatever heuristics they want to use), and gnome-settings-daemon would listen
to that to tweak the org.gnome.desktop.interface enable-animations GSetting.

Upstream bug: https://bugzilla.gnome.org/show_bug.cgi?id=680195

The upstream bug was upstream in time for GNOME 3.8.