yet I don't know where it could be placed by default
Well, It could be placed in toolbar or treebar..
In the place I've marked in
this image would work fine. Of course there'd be an option to hide it...but its not quite fair to just not put it in. Everyone has their own needs, and some people like to know if their computer is lagging. I know I do.
Note: "this image" is a link directly to the image.