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Rust is better for writing multithreaded applications which means that the small amount of utilities that can utilize parallelism receive a significant speedup. uutils multithreaded sort was apparently 6x faster than the GNU utils single threaded version.
P.S. I strongly doubt handwritten assembly is more efficient than modern C compilers.
In large applications maybe not, but in benchmarks there can be a perfectly optimized assembly
Of course, for hot paths or small examples it is, but I doubt it's feasible or maintainable to write a “real” projects like core utilities in assembly.
Everyone knows you can do Roller Coaster Tycoon at most, no way you could do core utilities.