> You might wonder: 5% seems awfully conservative. However, note that this figure is the geometric mean. The number can range from slower to significantly faster. All numbers are pyperformance figures.

Any way you slice it, this is unimpressive. The effort spent on making CPython jit-able seems entirely unjustified if this is the rate of progress we can expect. Especially given that PyPy has existed for over half of Python's lifetime now.