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glandium | karma 4683 | avg karma 2.42 · 2020-09-24 22:47:49+00:00

Caveat: pypy is not _consistently_ faster than CPython. There are cases where it is slower, sometimes even by a large margin.

Rochus | karma 2890 | avg karma 1.31 · 2020-09-24 22:55:50+00:00

Of course. It's clearly visible e.g. on https://speed.pypy.org/ that it doesn't show equal performance on all benchmarks. The factor four corresponds to the geometric mean of all benchmarks. And as you say there are benchmarks where it even performs slower than CPython.