Do multiple substacks slow down a program?

[Stgoldberg at aol.com]

So far I'm running close to 100% success with advice received from   this 
forum and am very grateful for that. One more question:   I'm planning a program 
that uses one or more substacks. The question is whether to place all the key 
data into one substack or to divide them into 2 or more substacks.   One the 
one hand, dividing into separate stacks keeps everything neatly arranged.   
However, does it slow down the speed of a program if scripting commands go from 
one substack to another, as opposed to remaining confined to one substack?   
Thanks.
Steve Goldberg