I've just tried an experimental change from Alexandros which looks like a good 
solution. It needs some polish and test cases but should be fully ready next 
week....
http://paste.ubuntu.com/6132595/

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https://bugs.launchpad.net/bugs/1216472

Title:
  [xmir] [multimonitor] Frames eventually get slightly out of order,
  look like glitches or typing will feel slow

Status in Mir:
  In Progress
Status in XMir:
  In Progress
Status in “xorg-server” package in Ubuntu:
  Confirmed
Status in “xserver-xorg-video-intel” package in Ubuntu:
  Confirmed

Bug description:
  Using multiple monitors, eventually the frames you see get slightly
  out of order and slightly lagged. Particularly when only one monitor
  is updating.

  TEST CASE:
  Open a terminal in XMir, move it onto a single monitor, and hold down a key.
  Expected: Key appears to repeat smoothly.
  Observed: Key sometimes appears to skip one character/frame ahead, and then 
back again.

  WORKAROUND (1)
  1. sudo apt-get install compizconfig-settings-manager
  2. ccsm &
  3. CCSM > OpenGL > (untick everything except maybe "Sync To VBlank")

  WORKAROUND (2)
  Use simpler single buffering desktop environment, like Xfce.

  WORKAROUND (3)
  Unplug all external monitors. Use a single monitor :(

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