[BUG] Display glitches and performance lag with large messages/responses

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?

Description

The Claude Code display has significant performance issues when dealing with large content, making the interface unusable in certain scenarios.

Issues Reported

1. Display Resets and Scrolling Problems

When either user input, AI responses, or large bash command outputs are displayed, the interface repeatedly scrolls to the top from the start of the conversation. This forces users to scroll back to where they were working. With larger conversations, this can take over a minute to resolve.

Triggers:

• Large user messages
• Large AI responses
• Large bash command output (e.g., verbose logging, data dumps)
• Particularly bad when accumulated across multiple turns in the same chat

2. Ctrl+O Display-All Text Performance Lag

The keyboard shortcut Ctrl+O (display all text) causes the application to lag significantly, sometimes becoming nearly unresponsive, especially when large text has appeared anywhere in the chat history.

Enviroment:

Any, windows, SSH remote, Linux. for all users this is present.

What Should Happen?

Expected Behavior

• Display should remain stable and not reset/scroll when handling large content
• Ctrl+O should display all text without noticeable lag
• Performance should remain acceptable in longer conversations with substantial content

Error Messages/Logs

Steps to Reproduce

Steps to Reproduce

1. Start a Claude Code session
2. Generate or paste a large bash output (>100 lines), during long chats.
3. Observe display glitches and unwanted scrolling
4. Press Ctrl+O to display all text
5. Observe lag/unresponsiveness

6.

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.6 (Claude Code)

Platform

Anthropic API

Operating System

Other Linux

Terminal/Shell

WSL (Windows Subsystem for Linux)

Additional Information

_No response_