The overall effect of this change, and a number of others with it, actually boosts single-threaded performance slightly—by around 10%, according to some benchmarks performed on a forked version of the interpreter versus the mainline CPython 3.9 interpreter. Multithreaded performance, on some benchmarks, scales almost linearly with each new thread in the best case—e.g., when using 20 threads, an 18.1× speedup on one benchmark and a 19.8× speedup on another.
The overall effect of this change, and a number of others with it, actually boosts single-threaded performance slightly—by around 10%
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