moving panels is very slow

[Alistair Buxton]

to reproduce:

1. login to "gnome classic"
2. windows-alt-right-click on the panel and open properties
3. uncheck "expand"
4. drag the handles to move the panel

result: the panel moves by 1 pixel and then freezes. the preferences window also becomes unresponsive. after about 10-15 seconds the panel jumps to the position of the mouse.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnome-panel 1:3.4.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Wed May 16 17:11:07 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-panel
UpgradeStatus: No upgrade log present (probably fresh install)