>>>Is this function a part of the procedure library?
>
>The function is part of a procedure library and is called from all over our package from both classes and functions in other libraries.
>
>>>In what order the classes/procedures are loaded in memory?
>
>I have no clue. We SET PROCEDURE TO for all our function libraries when the package starts up and never unload them. Is that what you're asking?

Yes, I think if you just set procedure to one procedure file it would be quicker.

In other words, you may try (if this function doesn't have extra dependencies):

lcSaveClasslib = set('classlib')
lcSaveProc = set('procedure')

set classlib to
set procedure to myProcedureWithFunction
myFunction
* restore set proc and set classlib.

Also I just read Gregory's advice and I think the slowness may be also triggered if you have lots of tables open and you don't prefix your variables with m.