[BUG] Input delay in Claude Code CLI VScode Windows

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?

The delay between pressing a key, and the characters rendering in the terminal CLI is >500ms.

What Should Happen?

You type, and the letters appear in the CLI in a reasonable time.

Error Messages/Logs

Steps to Reproduce

Open VScode , launch claude code, type something.

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

1.0.115 (Claude Code)

Claude Code Version

1.0.115 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

Nothing has changed, it appeared out of nowhere overnight. I haven't changed any extensions, claude files, vscode version - nothing.

I have tried;

• Logging in and out
• uninstalling and reinstalling
• rm -rf /.claude/
• rm-rm /%appdata/code
• rm -rf %temp%
• Adding various settings to settings.local file in VScode from online suggestions

If I open claude code in a regular windows powershell window, the delay ceases to exist. It only happens in VScode.