system-config-kickstart is too slow and eats a lot of CPU

The application is way too slow, especially when browsing in the combo boxes.
The top tool shows it's eating 60+% of CPU power during user interaction.
There seems no way, more over, to select the packages to be installed.
I would expect a much lighter application!

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: system-config-kickstart 2.5.20-0ubuntu22
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic-pae 3.0.4
Uname: Linux 3.0.0-12-generic-pae i686
ApportVersion: 1.23-0ubuntu3
Architecture: i386
Date: Wed Oct 26 14:58:15 2011
InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=
 LC_COLLATE=C
 PATH=(custom, user)
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: system-config-kickstart
UpgradeStatus: No upgrade log present (probably fresh install)