Any Clues Why DTExec.exe Is Slower Than Business Intelligence Studio(SSIS Shell)?

All,

I have a simple package in SSIS that reads approx 2.5million rows from SQL2k5 source and exports it into 4 Foxpro files.
The way I do it is as below
1) use and oledb source to read data from SQL2k5
2) use a conditional split component to divide the source into 4 streams ( I do a recId % 4 = 0, 1, 2, 3 to give 4 streams)
3) use an OLEDB destination to export to the 4 prexisting foxpro tables.

This thing runs amazingly fast when I run(F5) it from Business Inteligence studio, but it is atleast 10 times slower when rightclick the package and execute using dtexec.exe

I can't figure out why! any clues??

I would elimiate the 64 bit /32 bit problems because export to foxpro only works in 32 bit mode and my package has been configured to run in 32 bit mode.

Appreciate any insights

Thanks,
Saptagiri Tangudu
PNT Marketing Services