Christian Hergert authored Apr 26, 2016 and Matthias Clasen committed Apr 26, 2016

Typically, there won't be any references on old frame timings except for
the most recent timing. So instead of discarding these and re-entering
gslice twice, just steal the old frame timing and reuse it.

https://bugzilla.gnome.org/show_bug.cgi?id=765592