An interesting alternative for speed and space would be ProBasic from
Beagle Bros. This modular Applesoft is incredibly powerful and
versatile for many programming tasks. One creates modules from either
Applesoft or Machine language and/or incorporate external modules (as
available). Speed is automatically increased by reducing the number of
program lines in each module.
Not sure I know what you mean.
A program must always execute all the statements called for by
the control flow, regardless of modularization.
Changing module size could only *add* to the number of module
crossings required to execute a program, never subtract.