Do you have an article about that? I would be interested to learn more about it.
Sadly the page isn't available on Google Books anymore[0], you might still be able to get the book itself. There also might be a Hacker News thread on it too or it'll be on Reddit. It's one of those places I'll have seen it on.
[0] https://books.google.co.uk/books?id=eulODwAAQBAJ&lpg=PA136&d...
Python might not be the most performant, but once you need the scale, it's a good problem to have because at that point, your product has already made it.