Data Warehouse Incremental job performance on very large datasets (Oracle)

Document ID : KB000110864
Last Modified Date : 17/10/2018
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After upgrade to 15.2 customer found that the Load Data Warehouse - Incremental is taking much longer than the Full Load and takes an average of 12 hours to complete
What could be causing the issue?
This is a known defect DE38853 and  has been fixed in 15.4.1.