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First, Do you have many subpartition?
Indeed, This is a matter of expdp, but *"Rediscovery Notes:"* says *"DW process shows a long time executing SQL accessing KU$_TEMP_SUBPARTDATA_VIEW"* .
So to my understanding, this bug cause your performance issue of impdp.
If you need to confirm, create SR..
WORKAROUND:So for this partition table, You use conventional exp/imp.