CLI Agent text input experiences brief slowdown when outputting text

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1

Where does the bug appear (feature/product)?

Cursor CLI

Describe the Bug

The agent CLI text input experiences brief slowdown when I’m inputting text while the actual agent is doing work and outputting text. This is clearly a performance optimization, but when I was using competitors, this didn’t happen.

Steps to Reproduce

Use the cursor CLI to do a task, and try typing while the agent does work and outputs text to the screen

Expected Behavior

There shouldn’t be any noticeable slowdown

Operating System

Linux

Version Information

About Cursor CLI │
│ │
│ CLI Version 2026.07.23-e383d2b │
│ Model Auto Balance │
│ OS linux (x64) │
│ Terminal unknown │
│ Shell bash │
│ Last Request ID 75731a21-eb3d-4148-94e6-34b27d031b1f │

Does this stop you from using Cursor

No - Cursor works, but with this issue

7

Hi @Fred_Tombs Thanks for the forum post! I tried to reproduce this on both Linux and Mac on the CLI and I didn’t run into the issue despite repeated attempts.

a few options that may help:

- Update to the latest CLI with `agent update`.

- If the lag shows up mainly while text is scrolling, wait for that turn to settle, then type the follow-up

- In a long session, start a fresh chat (or run `/summarize`), so the transcript stays smaller.

- If you use tmux, try the same flow once outside tmux

If you continue to see this behavior feel free to let me know and we can revisit it

8

Also getting this error even after updating. I have to type my next message really slowly so that it doesn’t skip characters.

Potentially related to slowdowns due to tmux constantly redrawing - reducing tmux history has helped me somewhat: Cursor CLI should limit history retention to reduce tmux refresh churn - #12 by gavinc).