Why Rider and ReSharper Were Slow to Start, and How Microsoft Helped Fix the Problem
JetBrains identified that Microsoft Defender's real-time scanning of out-of-process (OOP) architecture caused significant IDE startup latency. The company collaborated with Microsoft to optimize scanning behavior and released a diagnostic tool to mitigate these performance bottlenecks.
Verified State Diff
Impact & Verification Analysis
Developers using ReSharper or Rider on Windows environments protected by Microsoft Defender.
This addresses a critical architectural performance bottleneck that directly impacts developer productivity and IDE responsiveness in enterprise environments.
Full Fact Overview
The transition to an out-of-process (OOP) architecture for ReSharper and Rider introduced a performance regression where Microsoft Defender's file system and process scanning routines disproportionately impacted startup times. By profiling the interaction between the IDE's background processes and the Windows security stack, JetBrains determined that excessive scanning of temporary files and process memory was the primary culprit. The resolution involved a coordinated effort with Microsoft to refine scanning exclusions and the introduction of a specialized diagnostic tool to help users identify and resolve similar configuration-based performance issues.