Itunes for windows limitations

Does anyone know of a limitation on the itunes database size on a windows based pc ?
I have about 37000 songs by 12000 artists (appr 180 Gig) and updating the library is getting extremely slow. As the database is XML based, am I rapidly approaching the limit ? And are there any plans by Apple to deal with these kind of volumes in the future ?

I think I am running into the same thing. I have over 26,000 items of about 184 GB, and this translates into utterly unusable playback performance. Start playback and CPU usage spikes to 100%, playback stutters to nearly a halt, and if I don't stop playback, the pc spontaneously shuts down---no errors are ever written to Event Log. Memory usage for Itunes.exe process is constantly fluctuating between 70 MB and 172.
I have narrowed this down to itunes database performance (not a driver issue) because 1) Quicktime can play these files directly without incident and 2) Itunes on Another pc can play these tracks for hours from the shared itunes library without a burp--the difference is that it is not having to update the XML database with last played info, and or update any smart playlists.
(PC 1 is hosting the external 250 GB drive, and Itunes is managing these files. It is the one with the CPU/Playback issues. PC 2 can access PC 1's shared itunes library and play them back with no problem)
Obviously, this is less than ideal to have to manage the files in one iTunes library and only access them from another pc. In this scenario I can't even do the most basic functions--I'm listening to a song and can't rate it, delete it, give it a genre, comment, or even create playlists.
Apple better get to work on this. Large collections should not crash your pc.

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