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01 ·Compilers & Runtimes·★ MEMBER·11 min read Why Python Is Slow — Said Precisely Saying Python is slow bundles three unrelated complaints: the cost of a single operation, the way data is laid out in memory, and the fact that CPU work does not spread across threads. Objects and the eval loop, the real reason NumPy is fast, what the GIL actually protects, and how far free-threaded builds since PEP 703 get you — from zero assumed knowledge.