Where and in what context did Guido van Rossum say "If you want your code to run faster, you should probably just use PyPy."? [closed]

Question

PyPy's main page states that Guido van Rossum has said:

If you want your code to run faster, you should probably just use PyPy.

PyPy's home page does not refer as to where or in what context this statement has been made. Did he say that in a conference, a face-to-face talk with someone? What was the surrounding topic anyway? Was it about the performance of Python?

Answer 1

It's from his talk on type hints at PyCon 2015: https://www.youtube.com/watch?v=2wDvzy6Hgxg&t=16m52s