|This will happen every second Tuesday of the month. Yesterday I experienced similar condition although I let it run and it does not impact my work on the machine; I just let is run (for hours), eventually it comes up with updates to install.|
Since you seem to have a performance problem when the update service is running, I suggest to turn off "Check for updates" and run the service manually every month.
In the "Windows Update" Panel > Change settings > In the "Important Update section" select "Never check for updates".
Run the "Check for Updates" manually in the weekend or after your work (evening/night)