Why is my through put better with two applications than one application?

[ceyoung@bellsouth.net]

I have two functions, acquire data and write date to database.  If I divide these two functions into two applications run under one project, my through put is 100 Hz; but if put both function into one application my through put 10 Hz.

[Mark_Yedinak]

Code woudl help. Without it we would be shooting in the dark as to what your issue is.