All that does is disable throttling which means Windows Defender will use as much of your CPU as it wants. You can increase the limit beyond 50% if you like but you cannot reduce it to 0. Set-MpPreference -ScanAvgCPULoadFactor 50 Run the following command but replace the number at the end with how much CPU usage you want to allocate to Windows Defender. Decide how much CPU you want Windows Defender to be able to use.

By default, Windows Defender can use up to 50% of the CPU. The CPU usage is set as a percentage of your CPU’s total processing power. It only requires a little command to be run in PowerShell however, you will need admin rights to run it. Microsoft has a documented method that lets you limit Windows Defender CPU usage.