AV-Comparatives, AV-TEST show how Defender, McAfee, Norton, AVG hog your Windows 11, 10 PCs
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.
Microsoft Defender Comparative October While Microsoft Defender Installing Applications Impact Score Total Defense
Source: neowin.net