[Zope] updating catalog takes forever (never really completes)

[Christopher N. Deckard]

I have a ZCatalog with about 7,000 cataloged objects.  When I try
and update the catalog (the advanced tab), Zope seems to just spin
on it forever.  After a while it becomes unuseable.  Zope's been
updating the catalog for about 5 hours now and hasn't completed. 
What's going on and why is it taking so long?  

I set the threshold to 100 objects.  The last time I tried it with
the default of 10,000 it did the same thing.

Thanks,
-Chris