knockoutJS execute callback after foreach finishes rendering

In my code i want to execute function or callback just after KnockoutJS foreach binding finishes rendering all the items

i know i can do this simply by check if I'm at the last element (i found that here execute code after the last item has been rendered).
But using this my callback function 'll be called each time a new element or record is rendered.

I want to execute my callback function only once (for performance).

UPDATE

another solution is here success callback after knockout.js finishes rendering all the elements. but again using this my callback function 'll be called each time a new element is rendered.