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[Raymond Wells <rfw2nd@xxxxxxxxx>]

I had some success by opening up CompizConfig Settings Manager (Alt+F2,
ccsm assuming you have it installed.) and enabling "copy to texture"  I
noticed the CPU usage on my machine dropped from a hard 10% to about 2%
even with programs open.  I still find it odd that compiz's CPU usage
spikes when I drag windows or sometimes when I have smooth animations in
windows despite having the fglrx drivers installed, since it's supposed
to be hardware accelerated.  Leads me to believe that something is
causing it to do more work than it should on the software side.

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https://bugs.launchpad.net/bugs/803943

Title:
  compiz consuming a lot of cpu

Status in Compiz:
  Confirmed
Status in Compiz Core:
  Confirmed
Status in Unity:
  Confirmed
Status in “compiz” package in Ubuntu:
  Confirmed
Status in “unity” package in Ubuntu:
  Confirmed

Bug description:
  This problem is exclusive to unity (when running compiz with gnome-
  panel, this doesn't happen).

  1. Close all windows opened, if any
  2. Open a terminal and run 'top'
  3. Notice that compiz is consuming a lot of CPU time (although there is nothing special running). In my case, it's consuming about 13% when idle.
  4. Unmaximize the terminal window, if maximized, and start moving the window slowly
  5. Notice that compiz is now consuming much more CPU than before (in my case, arround 50%).
  6. Open a video.
  7. Notice that compiz consume much more CPU than idle (about 25% in my case), although I'm not doing anything related to window management.
  8. (optional) Install the gnome-panel package and choose "GNOME classic" in login screen. Start compiz with "compiz --replace" and follow the steps from 1 to 7. Notice that the CPU consuming is much lower (in my case, 1% when idle, 25% when moving the window and 9% with the video).

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: unity 4.0.1-0ubuntu2 [modified: usr/bin/unity-preferences usr/share/applications/unity-preferences.desktop]
  ProcVersionSignature: Ubuntu 3.0-2.3-generic 3.0.0-rc4
  Uname: Linux 3.0-2-generic i686
  Architecture: i386
  CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,vpswitch,imgpng,resize,snap,grid,regex,move,gnomecompat,mousepoll,animation,unitydialog,wall,workarounds,place,expo,ezoom,session,staticswitcher,fade,scale]
  Date: Thu Jun 30 11:54:20 2011
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha i386 (20110610)
  ProcEnviron:
   LANGUAGE=pt_BR:en
   LANG=pt_BR.UTF-8
   SHELL=/bin/bash
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)

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