Same problem here.
After importing the media library it's ok. But after the first restart it's 
very, very slow.
I've identified two queries against the database which took a long time:

sqlite> SELECT COUNT(*), SUM(CoreTracks.FileSize) FROM 
CoreTracks,CoreArtists,CoreAlbums, CoreSmartPlaylistEntries WHERE 
CoreArtists.ArtistID = CoreTracks.ArtistID AND CoreAlbums.AlbumID = 
CoreTracks.AlbumID  AND  CoreSmartPlaylistEntries.TrackID = CoreTracks.TrackID 
AND CoreSmartPlaylistEntries.SmartPlaylistID = 7 ;
14508|86984790003
CPU Time: user 28.910000 sys 8.170000

sqlite> SELECT COUNT(*), SUM(CoreTracks.FileSize) FROM 
CoreTracks,CoreArtists,CoreAlbums, CoreSmartPlaylistEntries WHERE 
CoreArtists.ArtistID = CoreTracks.ArtistID AND CoreAlbums.AlbumID = 
CoreTracks.AlbumID  AND  CoreSmartPlaylistEntries.TrackID = CoreTracks.TrackID 
AND CoreSmartPlaylistEntries.SmartPlaylistID = 8 AND MetadataHash NOT IN 
(SELECT MetadataHash FROM CoreTracks WHERE PrimarySourceId = 9);
14437|86520727025
CPU Time: user 30.410000 sys 8.380000

-- 
Banshee very slow when interacting with track lists
https://bugs.launchpad.net/bugs/474514
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