Like I mentioned, I started with a 25,000 track library from over 10 years of collecting mp3s, and the only time I experienced that type of slowdown was was on my W7 HP laptop. Perhaps it might be an issue of not allowing iTunes to consolidate your library and organize the files the way it would prefer, and optimizing the .xml file the way it needs to be.
This would be my suggestion if you were willing to give iTunes one more chance - it also still allows you to use your Traktor library and collection the way you want to. Also, I hope you've spent time "locking" each file. I hadn't my first time through Traktor, and the result was re-stripping each file a second time. Won't make that mistake again!
-- Get a external hdd / partitioned slice / whatever.
-- Back up all your files to that spot (including iTunes playlist)
-- Remove that source from iTunes and prevent it from being recognized in any scan in iTunes and Traktor.
-- Also, back up your Traktor collection files to prevent any unwanted changes from occurring (stripes / transients / etc).
At this point, you have a point at which you can resume your old state. Backed up iTunes files, backed up Traktor files, backed up original mp3 files and locations.
-- Change your settings in Traktor to prevent it from importing your collection, as well as changing the location where it looks for music to a dummy folder that is currently empty.
-- Close Traktor
-- Then go through and delete your Traktor collection files
-- Allow iTunes to organize your library (will probably take a little time considering the size of your collection).
-- Once that is done (and I usually reboot in an OCD-kind of way), open Traktor, point the music folder at the new iTunes /Music/ location where it has organized everything, and see if that improves any type of loading speed.
After that, you can either enable Traktor to import any new files and analyze them, or simply drag / click them into your collection when you load from the iTunes list. If you re-import your old Traktor collection files, you could do a consistency check to scan and find locations of files (which will take a while), or just re-import your entire collection playlist by playlist in iTunes.
On my 2010, it's so quick that if I make a change in iTunes while I am mixing (reordering a file, making a comment, removing from a playlist, etc), I can highlight "iTunes" in the Traktor browser window, click and refresh, and it takes roughly 5-15 seconds, depending on what else I am doing inside Traktor.
Anyway, that's what works for me.
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