Do you wonder why you Revit gets slower and slower? Yes?

Well, here is one possible reasion: If your Switch Windows-list look a bit like this:

then you should consider Close(ing) Hidden Windows once in a while:
Or just getting used to closing the view after you're done with it.

Resaon being: Revit recalculates all views whenever there is a change in the model or you save the model. That takes time, especially once your model gets a bit more complicated.

So close hidden fews frequently and get into the habbit of not having many views open at the same time.