If you use it in a web worker the UI does not hang. It requires a bit more setup though: https://pyodide.org/en/stable/usage/webworker.html https://pyodide.org

If you use it in a web worker the UI does not hang. It requires a bit more setup though: https://pyodide.org/en/stable/usage/webworker.html https://pyodide.org/en/stable/usage/webworker.html Edit: typo