There is no C# optimized variant because nobody wrote one. There is no claim that the C# program is optimized. Look at the table: there are "simple" and "optimi

There is no C# optimized variant because nobody wrote one. There is no claim that the C# program is optimized. Look at the table: there are "simple" and "optimized" variants for each language (except C#). The "simple" variants are intentionally not supposed to be optimized, and instead, use something approximating idiomatic code for the given language.