I was dealing with some emails when I noticed my cursor started lagging across the screen, so naturally I opened the control panel, and avast was using 100% CPU! Later, in roughly several minute interviews it decreased to 75%, 50%, 25% and then finally its normal CPU usage which is close to 0 for my processor. I'm guessing from the pattern that this is some kind of built-in diagnostic feature, but I am busy, and on top of that this computer had a problem with its GPU not long ago where I had to replace it at great expense, so I really do not appreciate having obscure features like this giving me a heart attack. Can you explain what exactly the program was doing?