Syntax statement for Globalalloc API call

I am runing VB6 thru NT 4.0 on a dual processor (PIII866MHz) machine with 512 MB RAM. My code has some very large dynamic arrays that easily approach 15 million elements, depending on the input data. Memory usage at run-time of my code is as follows:

Commit charge(K)
---------------
Total: 97488
Limit: 5224144
Peak: 729988

Given the commit charge, the fact that I have 512MB physical memory, and a lot of available virtual memory, how much memory could I specify in the Globalalloc API call to speed up the run-time?

Can you give me an example of a Globalalloc call that would work good?

Thanks

-lp