Redraws under the dash makes the dash too slow (active blur updates)

[Bucic]

Steps to reproduce:
1. Open Dash without any windows visible (do it with only Desktop visible).
2. Move cursor fast along various elements and note performance.
3. Make e.g. Firefox visible with YouTube.com loaded and video playing. You can try with other programs like Clementine player (its window) with music playing. Music without activity won't do (e.g. Nautilus).
4. repeat step No. 1 and note performance drop. Performance drop also visible per time it takes the Dash to close or open.

Expected behavior:
No visible performance drop.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: unity 6.10.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
Uname: Linux 3.5.0-18-generic x86_64
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
Date: Mon Nov 26 20:42:56 2012
InstallationDate: Installed on 2012-11-12 (13 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

I could swear there should have been a bug open for this already.

[Bucic (bucic)]

Is it related to this bug:
Dash invoked by Super Key twice as slow to show - https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1080276
?

I think 1080276 may be present because launcher animation happens underneath dash, hogging everything.

[Bucic (bucic)]

Is there a PPA with the latest fixes? It can't be worse than it is now...