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Claude Code on Windows with Malwarebytes: narrow folder exclusions for a measured 8.5x speedup (with security considerations)
Claude Code on Windows with Malwarebytes: folder exclusions for an 8× speedup
If your Claude Code sessions on Windows feel sluggish and Task Manager occasionally shows "Malwarebytes Service" at the top of the CPU list, the cause is almost certainly Malwarebytes real-time scanning the binaries and DLLs that Claude Code's Bash tool invokes on every call. A targeted set of seven folder exclusions reduces the wall time of a 6-parallel-Bash-tool-call burst from 64.78 seconds to 7.58 seconds — an 8.5× speedup, measured on an i7-12700F / 32 GB RAM system.
This document records which folders to exclude, why each one matters, and how to verify the fix using Malwarebytes' own service log.
Why not just develop on WSL2 or Linux?
A fair question, and for most Claude Code workflows the right answer really is "switch to WSL2 or Linux." Git operations, Python/Node/Go builds, and most web-backend work are dramatically faster under native Linux because of process-creation speed, filesystem semantics, and the absen