Bad rescanning performance

Hi,

newly I have the problem that the whole rescanning process takes two hours or longer. During the rescanning the web interface is not responding and slimserver.pl has a cpu usage of 100%. In the past the rescanning took just 10 minutes or so.

Do you have any ideas? I am using the Trackstat and Smartmix plugins. Attached some information about my configuration:

System

Mac Mini
2.4 GHz Intel Core 2 Duo
4 GB RAM

Logitech Media Server Status

Logitech Media Server Version: 7.8.0 - 1395409907 @ Thu Mar 27 13:17:03 PDT 2014
Hostname: servus.fritz.box
Server IP Address: 192.168.1.111
Server HTTP Port Number: 9000
Operating system: OS X 10.9.5 - EN - utf8
Platform Architecture: x86_64
Perl Version: 5.16.2 - darwin-thread-multi-2level
Database Version: DBD::SQLite 1.34_01 (sqlite 3.7.7.1)
Total Players Recognized: 1

Library Statistics

Total Tracks: 26,401
Total Albums: 2,008
Total Artists: 1,684
Total Genres: 451
Total Playing Time: 1846:26:51

Media Scan Details

Discovering files/directories: /Volumes/Data/Media/Audio (36497 of 36497) Complete 00:00:17

Removing deleted files: /Volumes/Data/Media/Audio (24 of 24) Complete 00:00:02

Scanning new music files: /Volumes/Data/Media/Audio (44 of 44) Complete 00:00:06

Scanning changed files: /Volumes/Data/Media/Audio (1 of 1) Complete 00:00:01

Discovering playlists: /Volumes/Data/Media/Audio/Playlists (7 of 7) Complete 00:00:00

Scanning new playlists: /Volumes/Data/Media/Audio/Playlists (6 of 6) Complete 00:00:10

Smart Mix Profile export (2333 of 2333) Complete 00:00:10

Find updated coverart files (563 of 563) Complete 00:00:03

Pre-caching Artwork (23 of 23) Complete 00:00:06

The server has finished scanning your media library.
Total Time: 00:00:55 (Tuesday, October 7, 2014 / 19.44)