Why is Python slower than C# for loops?

CPython interprets bytecode without JIT; loops execute one instruction at a time, unlike .NET's native compilation.

How do I optimize Python performance?

Swap loops for builtins like sum(), sorted(); use NumPy for vector ops — they drop to fast C code.

3.11 adapts somewhat, but full JIT like PyPy isn't default; Python 4 rumors swirl, but no guarantees.

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Python just schooled a .NET dev: stop writing loops. Libraries — and their C underbelly — are your speed lifeline.

DevTools Feed Apr 03, 2026 3 min read

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Originally reported by dev.to