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[Alex <axfelix@xxxxxxxxx>]

Performance issues usually won't be noticeable, more on the order of
5-10%. It's still one of those things that you'd expect to be fixed at
some point, since the compositor can eat a fair amount of CPU from
unredirected windows on non-super-powerful machines.

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https://bugs.launchpad.net/bugs/1307144

Title:
  'unredirect fullscreen windows' causes tearing

Status in compiz package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu release: 14.04
  Installed compiz version: 1:0.9.11+14.04.20140409-0ubuntu1

  The option 'unredirect fullscreen windows', which is enabled by
  default in Compiz, causes tearing in games and other fullscreen OpenGL
  applications, even with 'sync to vblank' options enabled in ccsm, in
  the GPU settings and in the game.

  With this option disabled, VSync works as fine as should with
  'unredirected fullscreen windows' enabled and there is no tearing (but
  this causes performance issues and the Unity panel shadow on top of
  the application).

  Tested with:
  - ASUS NVIDIA GTX 650-E-1GD5 with NVIDIA proprietary driver 331.38 (tested) (nvidia-331)
  - the same graphics card with NVIDIA proprietary driver 331.38 (nvidia-331-updates)
  - the same graphics card with Nouveau open source driver (xserver-xorg-video-nouveau)
  - Intel HD 4000 iGPU with default open source drivers

  
  *** NOTE TO PEOPLE REPORTING "SIMILAR" BUGS ***

  This bug is about unredirected fullscreen windows.  If you see menu
  bars, the Unity Panel, Indicators, a menu bar, a window title, or any
  other decorations you are not running in unredirected fullscreen mode
  and you are not experiencing this bug.

  A fullscreen window has content that occupies the entire screen, no
  borders, no menu bars, no Unity elements.  An unredirected window is a
  situation in which the application renders directly to the screen,
  without going through a compositor (such as Compiz).

  If you are seeing anything at all except your application content on
  the screen, this bug does not apply to you.

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