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[cmavr8 <803943@xxxxxxxxxxxxxxxxxx>]

Just to add data to the bug report, on my 4-core (8 threads) i7 setup,
with ATI graphics and google chrome, after 5 days my $ top shows:

top - 13:01:41 up 5 days, 19:52,  2 users,  load average: 1.13, 1.30, 1.38
Tasks: 292 total,   2 running, 289 sleeping,   0 stopped,   1 zombie
Cpu(s): 11.0%us,  5.3%sy,  0.0%ni, 83.1%id,  0.0%wa,  0.0%hi,  0.5%si,  0.0%st
Mem:   9200596k total,  8530880k used,   669716k free,   147956k buffers
Swap:        0k total,        0k used,        0k free,  3719712k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                          
 2358 chris     20   0 1676m 152m  26m S   44  1.7   1064:58 compiz                                                                           
 3054 chris     20   0 2014m 451m  17m S   17  5.0 248:06.63 chrome                                                                           
 1156 root      20   0  663m 259m 184m S   12  2.9 251:51.52 Xorg                                                                             
 2945 chris     20   0  957m 167m 7292 S    9  1.9 136:01.27 chrome 

Note how much CPU time compiz has used...

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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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