low fps rate under unity dash

[mehmet.nural]

When i open the unity dash the fps rate suddenly decreases and windows start to hang out.
My video card ati radeon hd7470m and i'm using mesa gallium driver (Gallium 0.4 on AMD CAICOS ) and mesa drivers have more performance than fglrx in my laptop.
I attached a video.
https://dl.dropbox.com/u/76369534/Untitled_Screencast.mp4

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: compiz 1:0.9.8.6-0ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-25.39-generic 3.5.7.4
Uname: Linux 3.5.0-25-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
Date: Thu Feb 28 02:52:25 2013
DistUpgraded: Fresh install
DistroCodename: quantal
DistroVariant: ubuntu
GraphicsCard:
 Advanced Micro Devices [AMD] nee ATI Caicos [Radeon HD 6400M/7400M Series] [1002:6760] (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Device [1043:2002]
InstallationDate: Installed on 2013-02-20 (7 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Beta amd64 (20121009)
MachineType: ASUSTeK Computer Inc. K54HR
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=tr_TR.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-25-generic root=UUID=57d930e1-45b9-45a6-8c81-0ba1b39c74e8 ro quiet splash vt.handoff=7
SourcePackage: compiz
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/03/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: K54HR.201
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: K54HR
dmi.board.vendor: ASUSTeK Computer Inc.
dmi.board.version: 1.0
dmi.chassis.asset.tag: ATN12345678901234567
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK Computer Inc.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrK54HR.201:bd11/03/2011:svnASUSTeKComputerInc.:pnK54HR:pvr1.0:rvnASUSTeKComputerInc.:rnK54HR:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
dmi.product.name: K54HR
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK Computer Inc.
version.compiz: compiz 1:0.9.8.6-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.39-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.0.2-0ubuntu0.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.0.2-0ubuntu0.1
version.xserver-xorg-core: xserver-xorg-core 2:1.13.0-0ubuntu6.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.99.99~git20120913.8637f772-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.9-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.2-0ubuntu3

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Andrea Azzarone (azzar1)]

Ubuntu 12.10 reached end-of-life so it's no longer supported. Can you
still reproduce this bug on 14.04 (or laters)?

[Launchpad Janitor (janitor)]

[Expired for unity (Ubuntu) because there has been no activity for 60 days.]

[Launchpad Janitor (janitor)]

[Expired for compiz (Ubuntu) because there has been no activity for 60 days.]

[Launchpad Janitor (janitor)]

[Expired for Unity because there has been no activity for 60 days.]