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You can compile PyPy without its JIT.

Yes, although without JIT it's slower than CPython. So, what's the point?

If you are happy using CPython, you can't be terribly concerned with performance. The point is, pypy will run on more platforms than its JIT targets.

Sure. But if you're already using CPython (as most users are), and you know Pypy will be 3x slower on your platform, why switch?

You have no reason to. We're talking about a hypothetical future where PyPy has become the reference implementation.