Chrome DevTools source search hangs in Next.js 16 on macOS 26

[emadurandal]

Link to the code that reproduces this issue

https://github.com/emadurandal/my-minimal-nextjs-issue-reproduction

To Reproduce

1. npx create-next-app@latest test-app --yes
2. cd test-app && npm run dev
3. Access to localhost:3000 or 127.0.0.1:3000
4. Open Chrome DevTools
5. Press Cmd+Shift+F to search sources
6. Search hangs forever

Current vs. Expected behavior

I expected that search hits something but search hangs forever

Provide environment information

- Next.js: 16.0.7
- Chrome: 142.0.7444.176
- OS: macOS 26.1

Which area(s) are affected? (Select all that apply)

Not sure

Which stage(s) are affected? (Select all that apply)

next dev (local)

Additional context

Works in

• Next.js 15.3.5
• Firefox DevTools with Next.js 16

My investigation has revealed that searches hang when using loopback addresses such as localhost:3000 or 127.0.0.1:3000. When accessing via IP addresses such as 192.168.0.2:3000, searches do not hang and successfully return results. I encountered this phenomenon on two Macs (both running macOS 26.1).

This happens in not only my own project but also plane next16.0.7 new project

[Bewenben]

Can confirm that I'm having the same issue with multiple projects on Windows 11 and Brave Browser

The moment I open the dev tools, it become so slow and and sometimes freezes