'Specify the maximum percentage of CPU utilization during a scan' (AvgCPULoadFactor % Min:0 Max:100) This policy setting allows you to configure the maximum percentage CPU utilization permitted during a scan. Valid values for this setting are a percentage represented by the integers 5 to 100. A value of 0 indicates that there should be no throttling of CPU utilization. The default value is 50. If you enable this setting, CPU utilization will not exceed the percentage specified. If you disable or do not configure this setting, CPU utilization will not exceed the default value. Counter Measure: Configure this setting depending on your organization's requirements. Potential Impact: Scanning can impact performance.

(1) GPO: Computer Configuration\Administrative Templates\Windows Components\Windows Defender\Scan\Specify the maximum percentage of CPU utilization during a scan (2) REG: HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Scan\AvgCPULoadFactor