unity-lens-music takes long time to retrieve information from hdd

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http://askubuntu.com – Everytime I open the dash and go to the music lens to search for a specific title, it takes quite a while till any titles are displayed and I can hear my hdd working during the process. I didn't copy too many of my CDs to my laptop so I don't really get why it takes the lens so long to load any matches. Is there a way to make the lens search from a customized database? Or does it use an approach like that by default? After reading the whole music library once the lens works really snappy and instantly displays titles. Sadly everytime I reboot and go back to the lens it again takes much long (HowTos)