"What I think goMac is trying to say is something like this: ShapeShifter is acting like a secret agent who infiltrates your office and replaces your files every time you go to look at them. He doesn't actually go into your filing cabinet and physically alter your files and folders, but when you pull something out to look at it, he rappels down from the ceiling Mission Impossible style and does a quick switch on whatever you're about to look at."

Which is why SS always sucks up system resources. *Always*.