create index nologging does not improve performance

We have a table which has 7m rows

create unique index ........ logging
Elapsed: 00:03:230.90

create unique index ........ nologging
Elapsed: 00:03:218.41

create unique index .........nologging parallel (degree 2); Elapsed: 00:04:282.39

Could somebody tell me why?

Thanks  

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