PollSystem doesn't seem to reduce usage unless other apps are busy trying to do something. This is okay in most cases, except for laptops like mine which slow down when processor usage is lower.
You should call PollSystem in the main loop, and if your game is doing something long and complex inside a function or method (like a level-loading stage), you should also call it periodically within that function.
You should call PollSystem in the main loop, and if your game is doing something long and complex inside a function or method (like a level-loading stage), you should also call it periodically within that function.