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I raised an official support request with Heroku for this. “It’s coming” along with other improvements to python build packs.

> The GitHub readme explains how it improves on Pipenv.

That's a shame it is not in the project webpage, though. This is the first information I searched, without success.

How is the execution time when resolving a non-trivial project? Like your typical Django app, for example.

Adding dependencies takes a (little) bit of time, because of the lockfile. But deployment (ie installing dependencies) is as fast as any dependency manager (pip, pipenv, ...).