Public bug reported:

After the upgrade to Mesa 9.2.0 unity is barely usable.
Dash, Alt+Tab switcher and Alt+F2 command line shows in more than 1 minute, 
using 100% cpu.

A downgrade to mesa 9.1.6-2ubuntu2 restores full performance.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: libgl1-mesa-glx 9.2-1ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-5.11-generic 3.11.0
Uname: Linux 3.11.0-5-generic i686
.tmp.unity.support.test.0:
 
ApportVersion: 2.12.1-0ubuntu3
Architecture: i386
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Mon Sep  9 01:51:45 2013
DistUpgraded: 2013-09-08 20:36:47,811 DEBUG enabling apt cron job
DistroCodename: saucy
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation Mobile 945GSE Express Integrated Graphics Controller 
[8086:27ae] (rev 03) (prog-if 00 [VGA controller])
   Subsystem: Micro-Star International Co., Ltd. Device [1462:0110]
   Subsystem: Micro-Star International Co., Ltd. Device [1462:0110]
InstallationDate: Installed on 2013-09-07 (1 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release i386 (20130424)
MachineType: MICRO-STAR INTERNATIONAL CO., LTD U90/U100
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-5-generic 
root=UUID=674329c8-d0a6-4954-89c0-72821cfa0ba8 ro quiet splash vt.handoff=7
SourcePackage: mesa
UpgradeStatus: Upgraded to saucy on 2013-09-08 (0 days ago)
dmi.bios.date: 12/01/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.3
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: U90/U100
dmi.board.vendor: MICRO-STAR INTERNATIONAL CO., LTD
dmi.board.version: Ver.001
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 10
dmi.chassis.vendor: MICRO-STAR INTERNATIONAL CO., LTD
dmi.chassis.version: Ver.001
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr4.6.3:bd12/01/2009:svnMICRO-STARINTERNATIONALCO.,LTD:pnU90/U100:pvrVer.001:rvnMICRO-STARINTERNATIONALCO.,LTD:rnU90/U100:rvrVer.001:cvnMICRO-STARINTERNATIONALCO.,LTD:ct10:cvrVer.001:
dmi.product.name: U90/U100
dmi.product.version: Ver.001
dmi.sys.vendor: MICRO-STAR INTERNATIONAL CO., LTD
version.compiz: compiz 1:0.9.10+13.10.20130828.2-0ubuntu1
version.libdrm2: libdrm2 2.4.46-1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.2-1ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.2-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.14.2.901-2ubuntu4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu6
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.14-4ubuntu3
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.9-2ubuntu1
xserver.bootTime: Mon Sep  9 01:46:55 2013
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                                1001 
 vendor                                     HSD
xserver.version: 2:1.14.2.901-2ubuntu4

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


** Tags: apport-bug compiz-0.9 i386 saucy ubuntu

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which is subscribed to mesa in Ubuntu.
https://bugs.launchpad.net/bugs/1222602

Title:
  Bad performance on GMA950

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