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[Daniel van Vugt <daniel.van.vugt@xxxxxxxxxxxxx>]

** Also affects: mir (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1454128

Title:
  [regression] Dragging windows by the titlebar is incredibly slow and
  laggy

Status in Mir:
  Fix Committed
Status in mir package in Ubuntu:
  New
Status in mir source package in Vivid:
  New

Bug description:
  [regression] Dragging windows by the titlebar is incredibly slow and
  laggy.

  Test case:
  1. mir_demo_server
  2. mir_demo_client_...
  3. Drag the client by the titlebar

  Expected: Window moves in response to the mouse.
  Observed: Titlebar turns dark grey, window hardly moves, only very slowly.

  Strangely Alt+drag is still fast so the slowness is related to the
  titlebar changing colour.

  I've bisected the problem and it was introduced in:
  ------------------------------------------------------------
  revno: 2563 [merge]
  author: Alan Griffiths <alan@xxxxxxxxxxxxxx>
  committer: Tarmac
  branch nick: development-branch
  timestamp: Mon 2015-05-11 17:14:31 +0000
  message:
    examples: repaint the titlebar to give an indicate the (in)active status of a surface.
    
    Approved by Kevin DuBois, PS Jenkins bot.
  ------------------------------------------------------------

  Also worth noting I have my mouse configured for 1000Hz instead of the
  default 125Hz (usbhid.mousepoll kernel parameter). But of course it
  should still be responsive.

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