Time to first byte increased to unbearable values

Support Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Agent/Ask just became so slow to start replying. I think it takes close to a minute for it to start producing first reply. It feels at least two times slower. Sometimes it feels 3-5 times slower. I find myself more often using completion mode. I thought that it was related to me using sonnet-4 instead of auto, but I tried to switch to auto a couple of times. Without noticeable difference, except model getting dumber.

Waiting 30+ seconds on simple prompt like “replace all errors.Wrap in this file with fmt.Errorf” is unbearable.

It’s hard to define exact version or time, but within last two weeks. And I think there was 2-3 cursor updates since then.

Steps to Reproduce

Just use AI pane

Expected Behavior

I expect model to produce some output and start using tools way faster.

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.6.42
VSCode Version: 1.99.3
Commit: 5911e9593196a000b1c00553aaf03b0b32042b90
Date: 2025-09-20T17:16:56.346Z
Electron: 34.5.8
Chromium: 132.0.6834.210
Node.js: 20.19.1
V8: 13.2.152.41-electron.0
OS: Darwin arm64 24.0.0

For AI issues: which model did you use?

sonet 4, auto

Does this stop you from using Cursor

No - Cursor works, but with this issue

2

Hey, thanks for the report. Your network might be unstable. Did you try checking this in another project or in an empty Cursor window?

3

I have at least 4 active projects and been working on all of them. Do you have metrics/logs/whatever that I can enable? Run a couple of prompts, collect debug information, review content and send it to you?

Do you have a decent way to prove that my network is the thing to blame?

Just tried to time it. A new window. Empty project. Single prompt.

Time to first symbol in the chat 2min 5seconds. Total time 5min 30sec. Content generated:

2.9K ./README.md
5.1K ./app.py
103B ./requirements.txt
463B ./run.sh
12K ./static/script.js
6.4K ./static/style.css
2.1K ./templates/index.html
8.1K ./torrent_scanner.py

then asked it to check spelling in the readme, e66da705-c66b-41c1-975b-bda59f088b59.

2min 4sec til first word generated, 2min 10sec to complete (6 secs).

4

Can I get some real help here?

5

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