[BUG] High CPU and battery drain when using

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?

Extremely high CPU usage and battery drain when using Claude Code.

What Should Happen?

Low CPU usage and low battery drain. That’s just a CLI wrapper with conversation management not a crypto mining app.

Error Messages/Logs

None.

Steps to Reproduce

1. Open Claude Code from terminal
2. Open multiple instances (usually 4-10)
3. Run few commands for each
4. See battery drain metrics in System Monitor and CPU usage

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

1.0.128

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

• Processor: M1 Max
• RAM: 32 GB
• OS: macOS 26