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. mandelbrot source secs mem gz busy cpu load Rust 1.70 32,656 1332 6.70 98% 98% 99% 98% C clang 4.70 29,036 694 18.80 100% 100% 100% 100% k-nucleotide source secs mem gz busy cpu load Rust 5.21 135,388 1841 15.94 82% 54% 100% 70% C clang 9.49 128,920 1506 20.32 51% 44% 59% 60% binary-trees source secs mem gz busy cpu load Rust 3.48 199,856 721 12.62 88% 100% 87% 88% C clang 4.81 117,408 836 14.25 63% 63% 92% 78% fannkuch-redux source secs mem gz busy cpu load Rust 10.06 1,020 1016 39.36 93% 100% 100% 99% C clang 13.88 772 1557 54.43 95% 100% 99% 98% reverse-complement source secs mem gz busy cpu load Rust 1.69 994,988 1330 2.95 26% 45% 79% 24% C clang 2.19 994,284 750 3.28 14% 21% 40% 75% spectral-norm source secs mem gz busy cpu load Rust 1.97 2,440 1126 7.86 100% 99% 99% 99% C clang 2.08 3,212 569 8.27 100% 100% 100% 100% n-body source secs mem gz busy cpu load Rust 5.98 688 1753 6.02 0% 1% 100% 0% C clang 6.11 8 1391 6.17 54% 1% 0% 47% pidigits source secs mem gz busy cpu load Rust 1.75 3,012 1366 1.78 1% 100% 1% 0% C clang 1.75 2,616 452 1.88 5% 100% 1% 2% fasta source secs mem gz busy cpu load Rust 1.51 2,180 1906 4.66 76% 76% 83% 74% C clang 1.44 3,948 2268 5.74 99% 100% 99% 99% regex-redux source secs mem gz busy cpu load Rust 2.20 153,504 986 3.23 15% 32% 84% 16% C clang 1.41 154,436 1397 4.32 96% 69% 73% 70% Rust rustc 1.44.0 (49cae5576 2020-06-01) LLVM version: 9.0 C clang clang version 10.0.0-4ubuntu1 all Rust programs & measurements all C clang programs & measurements