It's been a few years since I ran Windows, but I remember some annoying behavior. - Every time you open a network drive in Windows Explorer, it will (sometimes

It's been a few years since I ran Windows, but I remember some annoying behavior. - Every time you open a network drive in Windows Explorer, it will (sometimes?) partially download the contents to scan for viruses. It was noticeable on wifi. - If you run grep in a large repo (in the multi-GB range), it will scan each file before letting grep access it. Ripgrep is multithreaded, but that didn't matter since Defender seemed to be single-threaded. I could see it pegging just one core as it made sure none of those text files had a virus. I ran Process Hacker, which had a tray icon you could quickly hover to see what's using CPU. I noticed Defender slowing things down often enough that it had to go.