fix: limit threads to preserve memory

[anshalshukla]

🗒️ Description

🔗 Related Issues or PRs

✅ Checklist

• Ran tox checks to avoid unnecessary CI fails:

  uvx tox

• Considered adding appropriate tests for the changes.
• Considered updating the online docs in the ./docs/ directory.

[unnawut]

let's try

[unnawut]

The build passes after this PR so I think we can stick to this solution