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[Cvetan Simsic <874619@xxxxxxxxxxxxxxxxxx>]

I am having issues with Radeon HD 6450, with both proprietary and open
source drivers. I don't have issues on Ubuntu 12.04, but everything
after that yes. Tried both Ubuntu 13.10 and 14.04. I switched to my
integrated Intel HD 2000, and didn't have issues.

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https://bugs.launchpad.net/bugs/874619

Title:
  Dragging windows around is slow/sluggish/laggy when multiple monitors
  are enabled

Status in Ubutter: Making Ubuntu buttery smooth:
  Fix Released
Status in Unity:
  Fix Released
Status in Unity 5.0 series:
  Fix Released
Status in “unity” package in Ubuntu:
  Fix Released
Status in “unity” source package in Precise:
  Fix Released

Bug description:
  [Test Case]
  A performance fix, just make sure that icon movement is fast.

  [Regression Potential]
  Visual regressions, shell drawing problems. Big change, many regression potentials.

  Original description:

  Description:	Ubuntu 11.10  / 3.0.0-12-generic #20-Ubuntu
  Quadro NVS 290 - Dual screen

  Display is too slow to be usable. Moving windows or icon is sluggish.
  Switching from Nouveau to Nvidia proprietary driver helps a bit but the issue is the same.

  I found 2 ways to "fix" this issue:
   * disabling Ubuntu Unity Plugin in CompizConfig Setting Manager
   * disabling one screen

  Disabling "Sync to VBlank" doesn't help
  Upgrading the nvidia driver with ppa:ubuntu-x-swat doesn't help

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