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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