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[Martin Horseling <martin.horseling@xxxxxxxxx>]

You may want to consider a related problem with the combination Compiz
and Clamav.  I did an upgrade last week from 10.04 to 12.04.  After
doing this, I noticed a significant slowdown in the performance,
basically it became unusable for work.

Looking at system monitoring, Compiz was somewhere in the range of using
50% of one processor, but more significant Clamav (installed from the
repositories in 10.04) was using close to or over 100% of one processor.
I could fry an egg on the laptop.  I killed ClamAv and then removed it
using package manager. This improved things instantly, though I must say
I still perceive it to be slower than 10.04.

Since it does not get hot anymore, but overall it is not great.

Hardware:  HP Compaq 6720S, HDD320GB, 1 GB ram.

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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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