Great news—we’ve hit our (very modest) performance goals for the CPython JIT over a year early for macOS AArch64, and a few months early for x86_64 Linux. The 3.15 alpha JIT is about 11-12% faster on macOS AArch64 than the tail calling interpreter, and 5-6% faster than the standard interpreter on x86_64 Linux. These numbers are geometric means and are preliminary. The actual range is something like a 20% slowdown to over 100% speedup (ignoring the unpack_sequence microbenchmark). We don’t have proper free-threading support yet, but we’re aiming for that in 3.15/3.16. The JIT is now back on track.
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