>Thank you for the responses and the Wiki link. We'll give these things a try :)

OK, you're welcome.

I think the problem is in the function. You can easily test this

&& test with FUNC_UNCLUDED .t. and .f.

#define FUNC_UNCLUDED .T.
function Test()
   local i, s
   
   set proc to
#if !FUNC_UNCLUDED
   set proc to .... additive
#endif

   s = seconds()
   && 3 sec and .3 sec is too small, try to get at 30 sec and 3.0 sec
   for i = 1 to 30000 && I multiplied your value by 10.  && testing can be done with 6000 or so to give an indication
     = function('aa', 'cc', 'cc')
   endfor

   ? seconds() -s

endfunc
*----
#if FUNC_UNCLUDED
&& copy the function here
#endif