This page simply 'echoes' the router's Stats page. It will only retrieve a fresh page from the router when the Router Stats Page is first selected or when the Refresh button is pressed. It will not continue refresh automatically unless the Refresh automatically... checkbox is checked.
In versions of RouterStats prior to 2.8d, the page would refresh continuously even when it wasn't being viewed. Not only is this wasteful of CPU resources but I've discovered an apparent "memory leak" in the 3rd party software I need to use to display the page in HTML form. By its very nature, RouterStats uses memory in order to be able to scroll the graphs back in time so unnecessary memory 'wastage' is to be avoided!