Dash invoked by Super Key twice as slow to show

[Bucic]

When Launcher auto-hide is disabled, Dash invoked by Super Key twice as slow to show up compared to when invoked by clicking on the Ubuntu logo. I observed this behavior both in Ubuntu 12.04 x64 and 12.10 x64 with every single Ubuntu vs hardware/driver combination:
Intel HD 4500
AMD mobility radeon 3650 with open source driver
AMD mobility radeon 3650 with Catalyst 12.6 (installed from various sources - didn't impact the behavior)

So at least 6 in total. I've athered quite a few command line off-line report files for the combinations.

Also it's not only me. See http://askubuntu.com/questions/138622/how-to-disable-all-unity-animations/169634#169634 , Point 3.

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
NonfreeKernelModules: fglrx
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
Date: Sun Nov 18 09:27:21 2012
InstallationDate: Installed on 2012-11-12 (5 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)

[Launchpad Janitor (janitor)]

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