Rust versus C clang fastest programs Always look at the source code. These are only the fastest programs. Look at the other programs. They may seem more-like a fair comparison to you. binary-trees source secs mem gz busy cpu load Rust 1.20 200,180 721 4.34 87% 87% 88% 100% C clang 7.49 351,380 908 27.01 98% 90% 83% 90% mandelbrot source secs mem gz busy cpu load Rust 0.92 32,716 763 3.66 100% 99% 100% 100% C clang 3.49 29,336 822 13.95 100% 100% 100% 100% regex-redux source secs mem gz busy cpu load Rust 1.28 153,400 986 1.76 14% 29% 83% 12% C clang 3.10 103,020 1115 3.10 0% 0% 100% 0% reverse-complement source secs mem gz busy cpu load Rust 0.75 995,164 1330 1.37 60% 49% 47% 26% C clang 1.08 994,240 750 1.60 87% 29% 13% 20% fannkuch-redux source secs mem gz busy cpu load Rust 6.88 1,224 1016 26.99 94% 99% 99% 100% C clang 9.79 972 1557 37.60 98% 97% 100% 90% fasta source secs mem gz busy cpu load Rust 0.93 2,332 1906 3.07 88% 82% 80% 81% C clang 1.29 744 1281 1.30 1% 0% 1% 99% n-body source secs mem gz busy cpu load Rust 3.31 836 1767 3.38 1% 1% 1% 100% C clang 3.32 8 1391 3.43 0% 100% 0% 3% pidigits source secs mem gz busy cpu load Rust 0.74 2,968 1366 0.75 1% 0% 0% 100% C clang 0.73 2,820 416 0.73 100% 0% 0% 0% spectral-norm source secs mem gz busy cpu load Rust 0.72 2,504 1055 2.85 100% 99% 99% 100% C clang Make Error k-nucleotide source secs mem gz busy cpu load Rust 3.22 131,280 1578 10.56 92% 89% 73% 74% C clang Make Error Rust rustc 1.47.0 (18bf6b4f0 2020-10-07) LLVM version: 9.0 C clang Ubuntu clang version 11.0.0-2 all Rust programs & measurements all C clang programs & measurements