Note: Assumption tables are already created and/or in existence.
I dump all data from a 7.3.5 db using LATIN9 encoding. When I restore it back to a 8.1.3 db using LATIN9 encoding it is much slower than restoring back to a 7.3.xx db. Restoration from 7.3.5 to 8.1.3 took more or less 24 hours against less than an hour from 7.3.5 db to any 7.3.xx db.