Public bug reported:

First, my laptop:
Intel Pentium Dual-Core T3200(1 Thread each core) 2.0 Ghz
3 GB Ram
128 MB Integrated Video

When I open the Dash all the computer starts to lag. MeMenu navigation
lags, the videos in the background lag, only the sound and the Dash
doesn't lag.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: unity 4.12.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-9.15-generic 3.0.3
Uname: Linux 3.0.0-9-generic i686
Architecture: i386
CompizPlugins: 
[core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,resize,fade,unitymtgrabhandles,scale,session,unityshell]
CompositorRunning: compiz
Date: Fri Sep  2 11:21:09 2011
DistUpgraded: Fresh install
DistroCodename: oneiric
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (primary) 
[8086:2a02] (rev 03) (prog-if 00 [VGA controller])
   Subsystem: Fujitsu Technology Solutions Device [1734:110e]
   Subsystem: Fujitsu Technology Solutions Device [1734:110e]
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta i386 (20110901)
MachineType: FUJITSU SIEMENS ESPRIMO Mobile V5505
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.0.0-9-generic 
root=UUID=41c20d2a-6758-4600-8122-faeaf30aa3bc ro rootflags=subvol=@ quiet 
splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/21/2009
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: R01-A1D
dmi.board.name: ESPRIMO Mobile V5505
dmi.board.vendor: FUJITSU SIEMENS
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: FUJITSU SIEMENS
dmi.chassis.version: A2040
dmi.modalias: 
dmi:bvnPhoenixTechnologiesLTD:bvrR01-A1D:bd01/21/2009:svnFUJITSUSIEMENS:pnESPRIMOMobileV5505:pvr20:rvnFUJITSUSIEMENS:rnESPRIMOMobileV5505:rvrNotApplicable:cvnFUJITSUSIEMENS:ct10:cvrA2040:
dmi.product.name: ESPRIMO Mobile V5505
dmi.product.version: 20
dmi.sys.vendor: FUJITSU SIEMENS
version.compiz: compiz 1:0.9.5.92+bzr2791-0ubuntu1
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.14.99~git20110811.g93fc084-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20110411+8378443-1

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug compiz-0.9 i386 oneiric reproducible running-unity 
single-occurrence ubuntu

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https://bugs.launchpad.net/bugs/839384

Title:
  Unity Dash has a very bad impact on the computer performance

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