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My Flask applications has to do quite a large calculation to fetch a certain page. While Flask is doing that function, another user cannot access the website, because Flask is busy with the large calculation.
Is there any way that I can make my Flask application accept requests from multiple users?
Yes, deploy your application on a different WSGI server, see the Flask deployment options documentation.
The server component that comes with Flask is really only meant for when you are developing your application; even though it can be configured to handle concurrent requests with
app.run(threaded=True)(as of Flask 1.0 this is the default). The above document lists several options for servers that can handle concurrent requests and are far more robust and tuneable.