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Launching 15 sub agents freezes TUI #24668

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Launching 15 sub agents freezes TUI#24668
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CLIIssues related to the Codex CLITUIIssues related to the terminal user interface: text input, menus and dialogs, and terminal displaybugSomething isn't workingperformancesubagentIssues involving subagents or multi-agent featureswindows-osIssues related to Codex on Windows systems

Description

@runfence
runfence
opened on May 27, 2026

What version of Codex CLI is running?

0.133.0

What subscription do you have?

Pro

Which model were you using?

No response

What platform is your computer?

Windows

What terminal emulator and version are you using (if applicable)?

Windows Terminal (PowerShell)

Codex doctor report



What issue are you seeing?


Seconds to accept typing, impossible to switch between agents using /agent command, often completely blocked input and CLI rendering stops


What steps can reproduce the bug?


Send a prompt where you ask model to perform some work (e.g. remove low-value unit tests) and tell it to split work into 15 sub agents. After agents are started, try to use /agent command a few times to switch between several of them.


What is the expected behavior?


No lagging, no deadlocks, normal operation


Additional information


No response
Activity
  1. runfence
    added 
    bugSomething isn't working
     on May 27, 2026
  2. github-actions
    added 
    CLIIssues related to the Codex CLI
     
    windows-osIssues related to Codex on Windows systems
     
    subagentIssues involving subagents or multi-agent features
     
    performance
     
    TUIIssues related to the terminal user interface: text input, menus and dialogs, and terminal display
     on May 27, 2026
  3. github-actions commented on May 27, 2026 
    @github-actions
    github-actionsbot
    on May 27, 2026 – with GitHub Actions
    Contributor
    Potential duplicates detected. Please review them and close your issue if it is a duplicate.
    


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  4. runfence commented on May 27, 2026 
    @runfence
    runfence
    on May 27, 2026
    Author
    

    Potential duplicates detected. Please review them and close your issue if it is a duplicate.
    

    * [CLI: subagents memory leak #23260](https://github.com/openai/codex/issues/23260)

* [Performance issues #23435](https://github.com/openai/codex/issues/23435)

* [Codex App/CLI: subagent tasks trigger reconnect loop and stream disconnect #24475](https://github.com/openai/codex/issues/24475)

    

    Powered by Codex Action
    

    

    Not a duplicate. This is about sub-agent performance, not performance in general, not a memory leak, not reconnects.
  5. runfence
    changed the title [-]Launching 15 sub agents makes CLI unresponsive[/-] [+]Launching 15 sub agents makes TUI unresponsive[/+] on May 27, 2026
  6. runfence
    changed the title [-]Launching 15 sub agents makes TUI unresponsive[/-] [+]Launching 15 sub agents freezes TUI[/+] on May 27, 2026
  7. sigyulee commented on May 31, 2026 
    @sigyulee
    sigyulee
    on May 31, 2026
    Maybe memory leak leads to freezing?
  8. leventov commented on Jun 5, 2026 
    @leventov
    leventov
    on Jun 5, 2026
    This is a hard blocker, codex team please fix this
  9. Patchy
    added a commit that references this issue on Aug 11, 2026
    tui: free event buffers for closed background agent threads
    97dccc8
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