Launching 15 sub agents freezes TUI

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_