Music lens takes very long to update on startup

[theghost]

The unity-music-lens causes a lot of HDD activity after login just to update a few changes on a large music collection (> 4k songs).

Steps to reproduce:

1. Get your music collection in the unity-music-lens
2. Delete / move some songs in / out of the collection
3. Reboot

It takes very very long until the changes are updated, which means heavy HDD activity a long time after startup.
Maybe the music-daemon rereads the whole collection instead of recognizing the changes only.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: unity-lens-music (not installed)
ProcVersionSignature: Ubuntu 3.8.0-21.32-generic 3.8.8
Uname: Linux 3.8.0-21-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
Date: Fri May 24 10:20:31 2013
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-03-14 (70 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130314)
MarkForUpload: True
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: unity-lens-music
UpgradeStatus: No upgrade log present (probably fresh install)