[AccessD] Requery on setting row source or record source

Dear List:
 
When setting the record source of a form or subform or setting the row
source of a combo or list box through code, is it necessary to also issue a
Requery?  Or does setting the source do a requery.
 
I've got an app with some 'flicker' on opening a couple forms.   On these
forms I set the sources programmatically on opening and I'm thinking that
some flicker may be due to unnecessary requerying.
 
MTIA
 
Rocky