I see wild (and explainable) mood swings in mir performance when we have
our clocks kicked out from under us. When this problem occurs, try
turning clocks up to 11:

echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

This at least turns the cpu clocks to high and probably turns the axi bus high.
i'd expect this to improve framerates from about 15->vsync (or at least that's 
what i see in my mir demo programs). If this is the case we're fighting over 
clocks with powerd.

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https://bugs.launchpad.net/bugs/1235190

Title:
  [mako] Unity8 on Mir got slow

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