Now cursor is very slow in both auto and or Claude sonnet 4, and keep disconnecting with errors

Support Bug Reports
1

Describe the Bug

i keep getting this error “Connection failed. If the problem persists, please check your internet connection or VPN
Stream closed with error code NGHTTP2_INTERNAL_ERROR [unknown]
Request ID: 11d686e4-6e63-4c8d-94e1-255a0df00ae8”

i have no VPN and other website are working fine

Steps to Reproduce

it happens all the time, when i restart cursor, works fine and then stop working and show this error

Screenshots / Screen Recordings

Screenshot 2025-07-17 135202.png
Screenshot 2025-07-17 135202.png1135×259 12.3 KB

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.2.4 (user setup)
VSCode Version: 1.99.3
Commit: a8e95743c5268be73767c46944a71f4465d05c90
Date: 2025-07-10T17:09:01.383Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Windows_NT x64 10.0.26100

Does this stop you from using Cursor

No - Cursor works, but with this issue

2

Hey, does it happen in new chats?

3

I’ve experienced this issue in both old and new chats performance has been very slow, and most of the time I encounter connection errors. At first, I thought the problem might be on my end, so I tested by subscribing to another agent (W), and to my surprise, it worked perfectly. Tasks were completed in minutes using the same Sonnet 4 model.

I’m not sure why Cursor has become so slow. It used to be excellent, especially before the recent changes to the pricing plans. I’ve been on the Pro package since the beginning and was really happy with the experience.

I genuinely like Cursor, but it’s hard to continue working when results aren’t even showing. I really hope the team can address the performance issues and bring back the reliable experience we had before.