News Microsoft Zaps 5-Year-Old Defender Bug, Reduces CPU Usage by 75% in Firefox

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defender used to be junk, back in old win7 days got massive lags in mmorpg sieges with defender, wasted like 80% cpu (6core cpu)
That is because back then it wasn't defender it was Microsoft Security Essentials and not baked into the OS. It was like a 3rd party AV and most of those suck up a lot of CPU resources. Defender is now part of the OS and works quite well as an AV.