[BUG] Claude Cowork super slow responding to input keystrokes (seconds), eventually cowork screen goes completely blank.

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?

Windows on ARM64, app version 1.21459.0 (Electron 42.5.1, Node 24.17.0). Severe input lag — multiple seconds between keystroke and echo. CPU/memory looked completely normal in Task Manager the whole time. Eventually the cowork screen goes completely blank.

What Should Happen?

Cowork should respond with normal speed and not fail.

Error Messages/Logs

Steps to Reproduce

Happens consistently on my machine - I can restart Cowork and it will continue for several hours gradually getting slower then fail with a blank screen.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

1.21459.0 (Electron 42.5.1, Node 24.17.0)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_