What did your software just try to do on my computer?

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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?

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It's an anti virus scanner... it scans your files... probably ran into a large file

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Well, I suppose that explains it but I have no idea what would warrant using up one hundred percent CPU.

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Unless it's continuously bogging you down I wouldn't worry about it.  Once in a great while is fairly normal.

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AvastSvc.exe usually takes many CPU resources during virus database updates (after restart or hybernate).
But I never noticed problems with the mouse during this process.