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. k-nucleotide source secs mem gz busy cpu load F# .NET Core 5.80 183,360 1907 19.47 86% 66% 88% 96% Java 9.14 403,576 1812 29.10 87% 72% 74% 86% binary-trees source secs mem gz busy cpu load F# .NET Core 6.28 724,124 635 22.76 91% 93% 90% 88% Java 8.28 948,040 835 28.20 80% 84% 87% 90% fasta source secs mem gz busy cpu load F# .NET Core 1.70 138,596 1350 6.45 95% 98% 93% 93% Java 2.22 43,096 2473 6.10 67% 83% 45% 80% regex-redux source secs mem gz busy cpu load F# .NET Core 7.87 971,632 599 11.18 64% 37% 28% 13% Java 10.27 635,500 740 29.42 74% 81% 55% 76% mandelbrot source secs mem gz busy cpu load F# .NET Core 5.78 65,644 933 22.72 99% 98% 98% 98% Java 6.84 76,008 796 26.90 99% 98% 98% 98% reverse-complement source secs mem gz busy cpu load F# .NET Core 2.93 1,031,696 1140 8.52 94% 45% 60% 90% Java 3.27 714,144 2183 7.54 47% 60% 66% 58% n-body source secs mem gz busy cpu load F# .NET Core 22.20 33,660 1290 23.03 0% 100% 1% 3% Java 21.85 34,112 1489 22.16 1% 0% 0% 100% pidigits source secs mem gz busy cpu load F# .NET Core 1.87 35,692 905 2.01 4% 2% 4% 98% Java 1.83 34,848 764 1.95 99% 1% 4% 2% spectral-norm source secs mem gz busy cpu load F# .NET Core 4.29 35,228 853 16.12 92% 92% 97% 94% Java 4.15 36,428 950 16.26 98% 100% 98% 97% fannkuch-redux source secs mem gz busy cpu load F# .NET Core 16.68 35,816 1097 65.52 98% 97% 100% 98% Java 16.12 33,168 1282 63.71 100% 98% 99% 98% F# .NET Core .NET Core SDK 3.1.201 Host Version: 3.1.3; Commit: 4a9f85e9f8 <ServerGarbageCollection>true <ConcurrentGarbageCollection>true Java openjdk 14 2020-03-17 OpenJDK Runtime Environment (build 14+36-1461) OpenJDK 64-Bit Server VM (build 14+36-1461, mixed mode, sharing) all F# .NET Core programs & measurements all Java programs & measurements