Pretty interesting writeup (including a reference to Pyston!): https://www.spacemonkey.com/blog/posts/go-space-monkey.  I’m sure I’m primed to read it this way, but it sounds similar to what we sometimes go through at Dropbox or in my personal projects: trying to optimize a Python program, and getting to the point that it’s simply bottlenecked on the performance of a large amount of Python code.  It’s interesting how Go seems to be establishing itself as the favorite replacement option.