[BUG] claude code for vscode responds very slowly for the first time

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 Claude Code VSCode extension has a problem where it sends a message once in a new conversation in the secondary sidebar, and when using a custom API, the AI response is very slow, taking around 27 seconds to recover. Of course, Claude Code also freezes the VSCode terminal for 15 seconds before you can input text. Claude Code has a serious performance bug when starting up in VSCode for the first time. Using Claude in the Windows terminal is fine, but I still want to use it in VSCode.

What Should Happen?

fix

Error Messages/Logs

Steps to Reproduce

￴

Claude Model

Sonnet (default)

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.0.55 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

Version: 1.107.0 (system setup)
Commit: 618725e67565b290ba4da6fe2d29f8fa1d4e3622
Date: 2025-12-10T07:43:47.883Z
Electron: 39.2.3
ElectronBuildId: 12895514
Chromium: 142.0.7444.175
Node.js: 22.21.1
V8: 14.2.231.21-electron.0
OS: Windows_NT x64 10.0.22631