Aghh!! you just brought me doubts to this question I though was understood and the answer i though was enough!
With your last sentence now I need you to clarify:
Let's say I have a widget that reads the news somewhere, taking 10 seconds for that, and then sends me an email and FINALLY it prints the news on the page.
Will excluding that widget with a conditional in widgetLogic prevent the whole thing to be executed? or just the "print/render" part?
Sorry for re-asking, but your comment after the clear answer from sswells makes me think you could be trying to correct her.