Why does the Micosoft Update slow down my computer?

I run Microsoft's Autoupdater, which checks for and prepares me for updates every week.
Unfortunately, it manages to do so at my expense!
Usually, I catch it, but this time I didn't see the little window and I was distracted with some other, newer applicaitons I had installed (Kaspersky).   Sill me, I focused too long on the anti-virus software and neglegleted what has become a small nightmare, for me.  My bad, but still, should any background application be able to co-opt the whole system like this?
How can I change the priority on Microsoft's Update application so that it can't pre-empt everything else?
Is there some other way to tune or modify this app, without just turning it off?

You can set the Microsoft updater to not update automatically. It can be set to update manually. Eliminates one issue. Second issue is get rid of virus checking software. You don't need it.

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