Microsoft Defender, among several other popular AV products, can hog your system under certain situations, though they, including Defender, do a good job as a malware hunter, most of the time.
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Microsoft Defender is found to be one of the worst performers in AV-Comparatives test suite which measured performance impact by anti-malware apps. AV-TEST also found similar results.
Facial recognition is the next big thing that Apple thinks will secure its devices, ditching the fingerprint scanner in the iPhone X. However, a Vietnamese firm shows the tech still has a way to go.