Performance optimizations: eliminate O(n²) operations, fix correlation correctness, modernize pandas usage#9

Merged

EthanThePhoenix38 merged 10 commits intomainfrom

copilot/improve-slow-code-efficiency

Dec 17, 2025

Commits on Dec 13, 2025

Initial plan
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Implement critical performance improvements across modules

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Replace deprecated .values with .to_numpy() and format code

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Clean up unused code and improve error handling

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Apply advanced optimizations: use groupby and array indexing

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Address code review feedback: improve ordering, NaN handling, and error checking

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