Hi InfoMan,
Thank you for sharing your scenario with us.
Generally speaking, the cross-query solutions will always take longer time comparing to a solution with the same provider type (eg. source and destination = oracle). Have you tried to import the inventory table into oracle too?
Also could you please be more specific about 4.0.1.775? How much time did it take in this version? Are you sure it's exactly the same tables and queries?
Could you please provide us with table structure of both oracle and local storage tables including row count in each? I assume the oracle table is much bigger.
Martin