[BUG] Severe response delay (3–4 minutes) in WSL2 with VS Code Claude Code >= 2.0.74, resolved by downgrading to 2.0.72

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?

After upgrading the VS Code Claude Code extension to versions >= 2.0.74, I consistently experience very long response delays (around 3–4 minutes) when sending any prompt.

Downgrading the extension to version 2.0.72 immediately resolves the issue and restores normal response times (a few seconds).

This issue occurs reliably in a WSL2 environment.

Environment
OS: Windows 10 / 11
WSL: WSL2 (Ubuntu)
VS Code: latest stable
Claude Code extension:
❌ Affected: 2.0.73 and newer
✅ Works fine: 2.0.72
Node.js: 20.x (LTS)
Project location: Linux filesystem (/home/..., not /mnt/c)
Hardware resources: sufficient CPU and memory (issue persists regardless)

What Should Happen?

Output without delay

Error Messages/Logs

Extension does not crash or freeze, only delayed
Relevant log timing example:
Prompt sent: 10:56:11
First response chunk received: 11:00:48
Relevant Logs (excerpt)
10:56:11 Received message from webview (user input)
...
11:00:47 Writing to temp file: /home/user/.claude.json.tmp...
11:00:48 Stream started - received first chunk

Steps to Reproduce

Install VSCode on wsl2, and then install the Claude Code for VS Code plugin

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.75

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

WSL (Windows Subsystem for Linux)

Additional Information

_No response_