sql vs dataflow

Hi

I have table with 5 000 000 records and 100 columns (quite big table) and in one of my DF I copy all records into other table withpout any transformation.

I'm wondering why when I use DataFlow tha total time which is needed to copied all records is few times more then I use sql fucntion (select * from )  or event sql in script (insert into)

In DataFlow it takes 40 minutes, in sql functions: 15-20 minutes, in script 10 minutes

Could you explain me how it works?

Or maybe I need change some parameter in properties of DataFlow?

And how long does it take in your environment?

My DS cversion: 4.0 SP3

Database version: sql 2008 R2 (2 CPU; 32 GB RAM)

Aplication server: quad; 12 GB RAM

Regards