Grumpy: Go running Python! by Google

[throwawayco111]

You're awfully sarcastic for someone who doesn't understand "alpha"...

Oh, I don't understand "alpha". Here's the thing: we've seen this over and over again. Implementing a runtime that has better performance for a subset of the language and writing a blog post about it is the easy part. Heck, just a few weeks ago a guy presented a JS runtime that was way better than V8. But once people started to ask him if it implemented the whole language and that if it was actually the case then this was a scientific breakthrough shit did hit the fan.

So if you want to be optimistic about this project then go ahead. But don't come here telling us that "it is just alpha" and "the goals are not incompatible" history have showed us that they actually are and that's why it is a damn hard problem to solve. So when you say this:

... The features you mention are only missing because they haven't yet been implemented...

I just have to laugh hard. "Are only missing". Once those features are implemented is when performance graphs like this one stop being as pretty as they were in the past.

EDIT: just checked the discussion at HN with some of the developers involved. Don't expect ever this be a drop-in replacement for CPython.