I now also realize the bug isn't really about dynamic queue scaling either. The 
same issue happens with fixed double buffering:
   restart unity8 QML_NO_TOUCH_COMPRESSION=1 MIR_SERVER_NBUFFERS=2

The core of the problem is probably that the kernel scaling/frequency
governors clock down when not touching the screen, which is too slow for
double buffers. However if you're still touching the screen then it
remains fast enough for double buffers.

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https://bugs.launchpad.net/bugs/1476201

Title:
  Dynamic double buffering fails to detect inertial dash scrolling as
  slow; and stutters instead of scaling up to triple buffers.

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