calibre makes system unusable slow on first start

[BeowulfOF]

beowulf@seashell:~$ lsb_release -rd
Description: Ubuntu oneiric (development branch)
Release: 11.10
beowulf@seashell:~$ apt-cache policy calibre
calibre:
  Installiert: 0.8.8+dfsg-1ubuntu1
  Kandidat: 0.8.8+dfsg-1ubuntu1
  Versionstabelle:
 *** 0.8.8+dfsg-1ubuntu1 0
        500 http://de.archive.ubuntu.com/ubuntu/ oneiric/universe amd64 Packages
        100 /var/lib/dpkg/status

startet up calibre for first time and selected a folder for the ebook-lib. After that the system is under high load, the hdd spins without rest and the whole desktop is near zero reaktion to the user.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: calibre 0.8.8+dfsg-1ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-10.16-generic 3.0.4
Uname: Linux 3.0.0-10-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 1.22.1-0ubuntu2
Architecture: amd64
Date: Tue Sep 13 07:09:32 2011
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64+mac (20110413)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: calibre
UpgradeStatus: Upgraded to oneiric on 2011-09-11 (1 days ago)