Netlify CMS stuck in "Loading entry"

[sandoche]

I have a JSON file with an array containing about 440 items.
When I open this file in the content manager it stays stuck in Loading entry with the loading animation and my browser CPU usage goes up to 25% and the memory goes around 1GB on Brave or 2GB on firefox.

I tried with an array containing 30 items and it worked perfectly.

Applicable Versions:

• netlify-cms-app 2.13.1
• netlify-cms-core 2.33.1
• netlify-cms 2.10.66
• Git provider: GitHub
• OS: Windows 10

I tried in brave browser (chromium) and Firefox

CMS configuration
The configuration is here: https://github.com/sandoche/CuratedStack-nocode-template/blob/main/static/admin/config.yml
The content file is here: https://github.com/sandoche/CuratedStack-nocode-template/blob/main/content/links.json (this one works because it has around 30 items in the array of links, you could duplicate the items to get +400 items to reproduce the error.

[sandoche]

Actually it finally finished loading on Firefox after more than 10 minutes. I didn't make it work on chrome it seemed to crash before.
At the end is so slow that it's unsable and it takes a lot of resources.

I guess it's the same problem as #3415

[martinjagodic]

Closing as stale and/or outdated.