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 0.45 499,076 3040 0.95 24% 100% 24% 62% C gcc 0.86 712,208 820 1.27 99% 28% 1% 19% binary-trees source secs mem gz busy cpu load Rust 1.08 198,580 765 3.81 85% 99% 86% 84% C gcc 1.54 168,832 809 4.35 60% 67% 57% 100% k-nucleotide source secs mem gz busy cpu load Rust 2.68 159,112 1691 10.01 99% 91% 92% 92% C gcc 3.72 130,260 1506 12.07 100% 89% 78% 57% mandelbrot source secs mem gz busy cpu load Rust 0.93 32,644 763 3.71 100% 100% 100% 100% C gcc 1.27 31,792 1135 5.08 100% 100% 99% 100% pidigits source secs mem gz busy cpu load Rust 0.71 2,644 799 0.72 0% 0% 100% 1% C gcc 0.81 2,804 416 0.84 1% 2% 99% 1% regex-redux source secs mem gz busy cpu load Rust 0.77 145,284 2458 1.98 53% 90% 53% 60% C gcc 0.80 152,172 1397 2.01 52% 99% 48% 53% fasta source secs mem gz busy cpu load Rust 0.77 1,816 2529 1.53 99% 1% 0% 99% C gcc 0.78 1,156 1463 0.78 0% 0% 0% 100% fannkuch-redux source secs mem gz busy cpu load Rust 7.53 1,172 1020 29.57 99% 98% 100% 95% C gcc 7.58 872 910 29.61 100% 98% 99% 93% n-body source secs mem gz busy cpu load Rust 3.42 840 1753 4.20 100% 16% 4% 4% C gcc 2.18 768 1633 2.19 0% 100% 0% 0% spectral-norm source secs mem gz busy cpu load Rust 0.71 2,568 1055 2.84 100% 99% 99% 100% C gcc 0.40 872 1197 1.58 100% 100% 100% 98% Rust rustc 1.52.0 (88f19c6da 2021-05-03) LLVM version: 12.0.0 C gcc gcc (Ubuntu 10.3.0-1ubuntu1) 10.3.0 all Rust programs & measurements all C gcc programs & measurements