Prevent Control from being rerendered

Hi UI5 Experts,

is there a way to prevent controls from being rerendered?

A little Background: I created an IFrame control and as you might imagine rerendering an IFrame is very expensive. How could I achieve this? I was thinking of hooking into onBeforeRendering/onAfterRendering, store the DOM Elements created in the former rendering and reapply them in onAfterRendering. But I guess this will still result in some flickering :/

Any ideas?

BR

Christian