You seem to be accumulating lots of data in the hashes, are you sure it all fits in memory? As soon as you force the computer to swap memory pages to disk, the processing time grows insanely!
It might help to tie the hashes to a DBM file (DB_File, MLDBM, ...) or use a SQLite or some other database to hold the temporary data. Doing as much work as you can upfront in the Oracle database would most probably be even though. Sometimes a use DB_File;tie %data, 'DB_File', 'filename.db'; is all you need to change something from unacceptably slow to just fine.
Enoch was right!
Enjoy the last years of Rome.
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