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[Carl Johan <carljohanja@xxxxxxxxx>]

@Edwin 
Yes, seems likely. Since it works both for you and Colin, it is probably a new bug. Also, now that i have had more time to explore, the problem on my system is a bit different than what is described in this bug report. Visual effects are sluggish but not to as slow as described in this report. I will have to do a clean install and keep my fingers crossed.

Btw, my system is an Asus 1215n with Intel GMA 3150 and Nvidia Ion 2.

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https://bugs.launchpad.net/bugs/1222602

Title:
  [regression] [gen3] Mesa 9.2 makes Unity unusable on Atom class
  hardware and 943/945 graphics controllers

Status in Mesa:
  Confirmed
Status in Release Notes for Ubuntu:
  Invalid
Status in “mesa” package in Ubuntu:
  Fix Released
Status in “nux” package in Ubuntu:
  Fix Released
Status in “unity” package in Ubuntu:
  Invalid

Bug description:
  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

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