This bug was fixed in the package unity - 6.0.0-0ubuntu1

---------------
unity (6.0.0-0ubuntu1) quantal-proposed; urgency=low

  [ Didier Roche ]
  * debian/rules, debian/control, debian/unity-autopilot.install:
    - install new unity-autopilot package, containing autopilot bindings and
      test for Unity
    - add some python build-dep for executing setup.py
    - use dh_python2 and add some python:Depends dep for automatic python
      version detection
  * debian/control:
    - remove gnome-desktop dependency: not needed upstream anymore
    - unity Breaks older lenses due to path change
    - remove libgdu in build-dep
  * debian/libunity-core-6.0-5.install, debian/libunity-core-6.0-dev.install,
    debian/control:
    - version bump in libunity-core, change soname

  [ Matthieu Baerts (matttbe) ]
  * Update apport hook for python3 ; thanks to Edward Donovan (LP: #1013171)

  [ Łukasz 'sil2100' Zemczak ]
  * New upstream release.
    - compiz crashed with SIGSEGV in get_current_slide() from
      unity::BGHash::OnSlideshowTransition() (LP: #889625)
    - Unity is visible on top of fullscreen apps (LP: #734908)
    - App icon on the Unity Launcher lost track of running instance
      (LP: #772063)
    - unity crashed with NameError in reset_unity_compiz_profile(): global
      name 'GError' is not defined (LP: #778470)
    - compiz crashed with SIGSEGV in CompWindow::id() from getPaintMask()
      [compizminimizedwindowhandler.h] from unity::UnityWindow::glPaint()
      (LP: #851982)
    - HUD - Formatting of text in the auto-complete is wrong (LP: #939436)
    - [regression] Launcher is silent to screen reader users (LP: #949448)
    - still some accent issues with unity/nux (LP: #950740)
    - [regression] [precise] 3D apps run much slower under Unity (LP: #987304)
    - No launcher icon or Alt+Tab entry for Gimp windows (LP: #995916)
    - Locked smuxi launcher icon does not indicate smuxi running status
      (LP: #999820)
    - When number of workspaces is set to 1, the Spread no longer works
      (LP: #996604)
    - Much slower OpenGL frame rates with unityshell loaded, than plain compiz
      (LP: #988079)
    - Port to libudisks2 (LP: #1012000)
    - Desktop, Launcher and menu bar still visible when screen locked
      (LP: #886605)
    - Searching in the HUD freezes unity (LP: #1016239)
    - Dragged icons rendered under dash (LP: #1021541)
    - Regression in Launcher keyboard navigation (with Alt+F1) (LP: #1021549)
    - Unity dash is is much slower/laggy after revision 2469. (LP: #1021665)
    - Dash and Launcher - As soon as a user starts dragging a file from the
      Dash, there is a 'flicker' before the Launcher icons that are valid drop
      receptacles re-saturate (LP: #863230)
    - Dash - when a file is dragged from the Dash (Dash home, file lens, or
      music lens) and dropped on a Launcher icon, the Dash should
      automatically close (LP: #865168)
    - Refreshing active blur makes the dash painfully slow (LP: #874230)
    - Open dash, press Alt+f1 - dash remains open (LP: #919209)
    - application reopens itself when last instance is closed from
      windows/application switcher (LP: #926406)
    - HUD Draws improperly while searching for results (LP: #932531)
    - Spread/Scale should exit if Dash is invoked (LP: #944033)
    - Launcher - Add API to allow apps to override the Launcher tile
      colourisation with a colour of their choosing (LP: #962120)
    - Dash - search field is hidden by tooltips (LP: #978030)
    - Dash: Inconsistent hover/highlight/clickable area behavior (LP: #979686)
    - Black background around after dash is restored (LP: #992516)
    - Unity launcher shows internal partitions after they have been unmounted
      (LP: #994163)
    - Unity r2395 fails to build with libnux 2.12.0-0ubuntu1 (LP: #1010348)
    - Hud flickers when show up. (LP: #1011507)
    - Nothing should be written into the dash/hud searchbar when holding
      super, ctrl or Alt (LP: #1013751)
    - Releasing mouse button outside panel 'close' window button removes
      keyboard focus from Dash & Hud (LP: #1021087)
    - [regression] Unity panel transparency (active blur) not updating
      properly (LP: #865006)
    - When selecting an action from a quicklist after opening the dash the
      dash stays put (LP: #937338)
    - Wrong keyboard focus after opening workspace switcher via keyboard
      navigation (LP: #962408)
    - can't click to dismiss hud in the area where dynamic hud results are
      meant to apper (LP: #962651)
    - launcher reordering "line" doesn't go to the bottom slot (LP: #971421)
    - Tooltips backgrounds are not refreshed (no active blur) (LP: #967112)
    - Dash maximise button changed location (LP: #987674)
    - alt-backtick flickers between windows (LP: #987156)
    - When blur is disabled, shortcuts overlay and alt+tab switcher is
      completely transparent. (LP: #989291)
    - Duplicated applications icons on quick application restart
      (LP: #1003574)
    - [Hud] The result grid is not drawn in proximity of the search entry.
      (LP: #1008603)
    - [hud] The last button is not rounded. (LP: #1008656)
    - 'UnityNETWorkareaRegionWindow::resizeNotify' hides overloaded virtual
      function (LP: #1010303)
    - use of logical '&&' with constant operand (LP: #1010307)
    - Unity/Nux input window titles are too generic (risky to match): "panel",
      "launcher", "Dash" (LP: #1010338)
    - Hud should close with Alt+F4 (LP: #1019440)
    - Dragging windows around is slow/sluggish/laggy when multiple monitors
      are enabled (LP: #874619)
    - No launcher icon or Alt+Tab entry for Scribus windows (LP: #999171)
    - launcher is not refreshed after user session switch (LP: #1016430)
    - Alt F1 keynav mode is not disabled when the Hud is open (LP: #1020808)
  * debian/control, debian/rules:
    - switch to nux-3.0
 -- Didier Roche <[email protected]>   Mon, 09 Jul 2012 18:07:36 +0200

** Changed in: unity (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/874230

Title:
  Refreshing active blur makes the dash painfully slow

Status in Unity:
  Fix Released
Status in “unity” package in Ubuntu:
  Fix Released

Bug description:
  The Unity 3d dash graphics are just about perfect when either no
  windows are open, or any windows that are open are minimized. Dash
  mouse cursor and graphics lag when a window I have open is maximized,
  or a window that is not in a minimized-state.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: unity 4.22.0-0ubuntu3
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic i686
  .tmp.unity.support.test.0:
   
  ApportVersion: 1.23-0ubuntu3
  Architecture: i386
  CompizPlugins: 
[core,bailer,detection,composite,opengl,compiztoolbox,decor,gnomecompat,mousepoll,resize,grid,wall,snap,imgpng,unitymtgrabhandles,place,regex,move,vpswitch,animation,session,workarounds,expo,fade,ezoom,scale,unityshell]
  CompositorRunning: compiz
  CurrentDmesg:
   [  133.672073] Bluetooth: RFCOMM socket layer initialized
   [  133.672076] Bluetooth: RFCOMM ver 1.11
  Date: Fri Oct 14 08:38:18 2011
  DistUpgraded: Fresh install
  DistroCodename: oneiric
  DistroVariant: ubuntu
  GraphicsCard:
   ATI Technologies Inc RS780M/RS780MN [Radeon HD 3200 Graphics] [1002:9612] 
(prog-if 00 [VGA controller])
     Subsystem: Acer Incorporated [ALI] Device [1025:028d]
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: Acer Aspire 5517
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic 
root=UUID=842d4e0a-7d5d-4900-b7a2-2e40c4605196 ro quiet splash vt.handoff=7
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/12/2009
  dmi.bios.vendor: Acer
  dmi.bios.version: V1.04
  dmi.board.name: Aspire 5517
  dmi.board.vendor: Acer
  dmi.board.version: V1.04
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.04
  dmi.modalias: 
dmi:bvnAcer:bvrV1.04:bd08/12/2009:svnAcer:pnAspire5517:pvrV1.04:rvnAcer:rnAspire5517:rvrV1.04:cvnAcer:ct10:cvrV1.04:
  dmi.product.name: Aspire 5517
  dmi.product.version: V1.04
  dmi.sys.vendor: Acer
  version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu3
  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+7ubuntu7
  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

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