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Optimize in which direction? Readability, speed, memory? Towards generalization or modularization?

@Matteo Mirk thanks for replying me. I think Speed with memory efficent

Then you would need to write a benchmark for this code an measure the hot points, then you can decide where to intervene. Performance optimization can’t be done blindly just reading the code (apart from some well-known optimization patterns). It also depends on your scenario and usages. Keep in mind that often you can’t push optimization too far towards speed AND memory: in many scenarios those vectors are orthogonal.

okk thanks @Matteo Mirk