Bulk loading partitioned tables slower than heap tables?

Hi

I was wondering if anyone has experience bulk loading data to partitioned tables? I have run some tests and running bulk load (insert append) into partitioned tables is actually 40% more costy. For example to load up a 80 million rows table it takes around 8 minutes whereas with plain heap table it only takes 5

Test used:
LMT with 16MB uniform size extent
No ASSM
Parallel DML
Parallel Query
Degree 16

Regards

Alex

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