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How Did Microsoft Defender Slow Down the Startup of Rider and ReSharper?

JetBrains explains that scans performed by Microsoft Defender were adding tens of seconds to the first launch of Rider and ReSharper after ReSharper moved to an out-of-process architecture. In cooperation with Microsoft, Defender was improved, and JetBrains also released an open-source tool to measure the impact of scanning on development tools.