Rust versus C gcc fastest programs Always look at the source code. These are only the fastest programs. Do some of them use manually vectorized SIMD? Look at the other programs. They may seem more-like a fair comparison to you. reverse-complement source secs mem gz busy cpu load Rust 0.45 498,964 3040 0.77 25% 23% 100% 25% C gcc 0.86 712,208 820 1.27 99% 28% 1% 19% binary-trees source secs mem gz busy cpu load Rust 1.09 198,728 765 3.90 87% 98% 88% 86% C gcc 1.54 168,832 809 4.35 60% 67% 57% 100% k-nucleotide source secs mem gz busy cpu load Rust 2.70 159,048 1691 10.08 93% 92% 91% 99% C gcc 3.72 130,260 1506 12.07 100% 89% 78% 57% mandelbrot source secs mem gz busy cpu load Rust 0.93 32,676 763 3.70 100% 99% 100% 100% C gcc 1.27 31,792 1135 5.08 100% 100% 99% 100% regex-redux source secs mem gz busy cpu load Rust 0.77 147,524 2458 1.99 54% 59% 91% 54% C gcc 0.80 152,172 1397 2.01 52% 99% 48% 53% fasta source secs mem gz busy cpu load Rust 0.77 1,840 2529 1.59 66% 100% 4% 38% C gcc 0.78 1,156 1463 0.78 0% 0% 0% 100% fannkuch-redux source secs mem gz busy cpu load Rust 7.54 1,200 1020 29.78 97% 100% 99% 99% C gcc 7.58 872 910 29.61 100% 98% 99% 93% pidigits source secs mem gz busy cpu load Rust 0.71 3,044 799 0.73 1% 0% 1% 100% C gcc 0.59 2,444 1090 2.37 100% 100% 100% 98% n-body source secs mem gz busy cpu load Rust 3.29 1,196 1753 3.33 0% 100% 1% 0% C gcc 2.18 768 1633 2.19 0% 100% 0% 0% spectral-norm source secs mem gz busy cpu load Rust 0.72 2,672 1055 2.86 100% 100% 100% 99% C gcc 0.40 872 1197 1.58 100% 100% 100% 98% Rust rustc 1.55.0 (c8dfcfe04 2021-09-06) LLVM version: 12.0.1 C gcc gcc (Ubuntu 10.3.0-1ubuntu1) 10.3.0 all Rust programs & measurements all C gcc programs & measurements