Scans will be slowed (and CPU utilization will be elevated) by any other real-time security app, or remnants thereof. Make sure that you’ve run the cleanup utilities for any previously installed, or preinstalled,
Uninstalling unused programs, deleting unused files, and using Disk Cleanup will reduce the workload for your scans and shorten their run times.
In addition to physically removing files, you can further reduce the scan’s workload by excluding files. You can add your personal work files, media files, archived backups, disk images, etc., to the list
of trusted files simply by creating either path or type exclusions for them: