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Step 2: Optimize the S-Box Lookup

The substitution box (S-Box) is typically the bottleneck. A "Top" performer never uses a table lookup in RAM (which causes cache misses). Instead, they implement the S-Box as a series of constant-time bitwise logical operations (AND, OR, XOR, shifts). This is harder to code but yields a 3x speedup. A "Top" performer never uses a table lookup