Firefox 6 Performance is *very* slow. Appears no content is caching (no 304s ever received). Way slower than FF 5.

Since upgrading to FireFox 6 from FF5 performance of Web sites has taken a very dramatic nose dive for the worse. Performance is absolutely dismal.
On closer inspection with FireBug it appears that all requests are constantly re-sent from the server - no caching is performed whatsoever, so content like scripts (jquery from CDN for example) always reload with full 200 responses that are slow. Using Firebug I have not seen a single 304 (cached) response.
This is a straight update from 5.0 which worked reasonably well.
Any ideas?

Well, apparently it was all a MAJOR glitch/bug!
Today I thought I'd try it on an older iTunes (4.7) and, SURPRISE: the transfers came back to normal-speed!!! No file corruption, all sounds OK (for now).
So, it seems that the problem is iTunes 5.
Any idea how to downgrade iTunes back to 4.7?!

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    WPCPRODUSR 381
    WPCPRODUSR 382
    WPCPRODUSR 383
    WPCPRODUSR 384
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    WPCPRODUSR 395
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    WPCPRODUSR 399
    USERNAME SID
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    WPCPRODUSR 421
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    WPCPRODUSR 422
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    USERNAME SID
    WPCPRODUSR 444
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    USERNAME SID
    WPCPRODUSR 455
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    USERNAME SID
    WPCPRODUSR 466
    WPCPRODUSR 467
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    WPCPRODUSR 469
    WPCPRODUSR 470
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    USERNAME SID
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