Threading issue-Firefox freezes when updating feed with large amount of articles

One of my feeds has over 5000 articles in each update.
When NewsFox is downloading/updating this feed, Firefox becomes totally unresponsive. Control is restored once the feed is done updating.
I haven't looked at the source yet, but it seems to me like this could be caused updating the feeds on the same thread as the UI.
My platform: Windows Vista SP2, Firefox 3.0.13, NewsFox 1.0.5

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