F# .NET Core versus Java 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. regex-redux source secs mem gz busy cpu load F# .NET Core 4.37 985,812 599 6.26 78% 27% 17% 21% Java 5.75 647,984 929 18.61 82% 88% 77% 77% fannkuch-redux source secs mem gz busy cpu load F# .NET Core 8.91 34,216 1097 34.78 98% 99% 99% 94% Java 10.61 34,960 1282 42.06 99% 99% 99% 98% k-nucleotide source secs mem gz busy cpu load F# .NET Core 3.95 182,004 1907 12.46 94% 78% 78% 66% Java 4.57 485,000 1812 14.50 77% 74% 83% 82% fasta source secs mem gz busy cpu load F# .NET Core 1.13 77,452 1350 4.24 96% 96% 90% 94% Java 1.27 45,584 2473 3.91 82% 83% 73% 70% mandelbrot source secs mem gz busy cpu load F# .NET Core 3.77 63,096 933 14.76 98% 97% 98% 98% Java 4.14 71,012 796 16.29 99% 99% 98% 98% reverse-complement source secs mem gz busy cpu load F# .NET Core 1.53 1,030,248 1140 4.24 95% 89% 35% 58% Java 1.58 677,584 2183 3.76 55% 74% 48% 61% spectral-norm source secs mem gz busy cpu load F# .NET Core 1.56 33,784 853 5.83 94% 92% 96% 92% Java 1.57 39,376 756 5.94 96% 94% 95% 95% pidigits source secs mem gz busy cpu load F# .NET Core 0.97 34,372 905 0.98 1% 96% 1% 3% Java 0.94 36,644 764 1.07 98% 5% 2% 9% n-body source secs mem gz busy cpu load F# .NET Core 6.97 34,776 1617 7.28 100% 1% 3% 1% Java 6.74 36,480 1489 6.84 100% 1% 0% 0% binary-trees source secs mem gz busy cpu load F# .NET Core 2.67 575,900 635 9.04 87% 84% 84% 83% Java 2.48 2,496,112 835 7.88 78% 91% 74% 75% F# .NET Core .NET Core SDK 3.1.301 Host Version: 3.1.5; Commit: 65cd789777 <ServerGarbageCollection>true Java java 14.0.1 2020-04-14 Java(TM) SE Runtime Environment (build 14.0.1+7) Java HotSpot(TM) 64-Bit Server VM (build 14.0.1+7, mixed mode, sharing) all F# .NET Core programs & measurements all Java programs & measurements