Many people, such as myself, find Windows Defender to be very light on the system (with the exception of when you open a folder with a lot of .exe files, such as the download folder. WD will check those files, and it takes a little time)
Many people, such as myself, find Windows Defender to be very light on the system (with the exception of when you open a folder with a lot of .exe files, such as the download folder. WD will check those files, and it takes a little time)