If you want performance and Python 3, and are willing to contribute funding and wait a bit, then PyPy is what you're looking for. :)
I'm sure PyPy will eventually get there, but in the meantime, projects are still happening, so what's available now (or what's so close that it's considered complete and in testing) is a lot more interesting and useful.
PyPy3 has a beta release.
This would be like "If you want Earth without the pollution and are willing to move, then we've terraformed Mars already; we just need some fuel for the rocket to get you there."