seniorNumPy

How does NumPy handle internal slicing performance with large step sizes?

Updated May 17, 2026

Short answer

Slicing with steps modifies stride values, but large steps reduce cache efficiency.

Deep explanation

When slicing with a step (e.g., arr[::k]), NumPy adjusts strides to skip memory locations. While this is still a view, large step sizes lead to poor spatial locality, increasing cache misses and reducing SIMD efficiency.

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