[BUG] 20m for a single line edit

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?

Claude Code is taking a very long time for seemingly small changes. I have been working to the same codebase for a couple of weeks but only started noticing the very long pauses since this week.

Claude code suggest single line edits, and goes away to apply them... and then it usually takes 20 to 30 minutes, not even always ending. I'm using Sonnet 4.6, medium effort.

What Should Happen?

It should take seconds for single line edits, not 20 minutes.

Error Messages/Logs

Steps to Reproduce

The files are long, but Claude Code pinpointed the exact lines to change.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.83 (Claude Code)

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

WSL (Windows Subsystem for Linux)

Additional Information

_No response_