Considering also related bug 1497105 and bug 1488386, I think all three would 
benefit from us removing input resampling completely from the top-level (unity8 
process) via:
   QML_NO_TOUCH_COMPRESSION=1
   MIR_CLIENT_INPUT_RATE=0

That would immediately solve this bug, and bug 1497105, and partially
solve the keep-awake problem of bug 1488386.

The only issue then is to make sure shell elements are still responsive
in the presence of high frequency input events. Apps themselves would
not be affected because they already have their own resampling.

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https://bugs.launchpad.net/bugs/1486341

Title:
  [performance] Touch scrolling is stuttery under Unity8 (but only while
  you're touching it)

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