[BUG] Version 2.0.x very slow key input on Windows with Malwarebytes enabled
Status Fixed / completed
Maintainer reply None cached
Activity 4 comments · opened Oct 2, 2025 · closed Oct 14, 2025
Preflight Checklist
- [x] I have searched existing issues and this hasn't been reported yet
- [x] This is a single bug report (please file separate reports for different bugs)
- [x] I am using the latest version of Claude Code
What's Wrong?
When running claude from a powershell 5 or 7, keyboard input is very slow and sporadic, initially not responsive. With each key entry, I notice the MBAMService process becomes very busy, taking 10-30% cpu.
I didn't experience this issue on 1.x.
What Should Happen?
Claude should respond normally, even with MB in use.
Error Messages/Logs
No error messages. Just very slow responses.Steps to Reproduce
- Run claude from Windows 11 powershell, either version 5 or 7
- Type any command
Claude Model
Sonnet (default)
Is this a regression?
Yes, this worked in a previous version
Last Working Version
1.0.x
Claude Code Version
2.0.5
Platform
Anthropic API
Operating System
Windows
Terminal/Shell
PowerShell
4 Comments
Found 3 possible duplicate issues:
This issue will be automatically closed as a duplicate in 3 days.
🤖 Generated with Claude Code
If I disable Malware and PUP protection in MB, it works around the issue.
Got my answer in the forum:
https://forums.malwarebytes.com/topic/329276-malwarebytes-real-time-protection-severely-slows-claude-code-cli-startup-de/#comment-1719128
Add C:\Program Files\Git to the Allow list.
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