F# .NET versus C# .NET fastest performance Always look at the source code. If the fastest programs are hand-written vector instructions, does the host language matter? You might be more interested in the less optimised programs — more seconds, less gz source code. fannkuch-redux source secs mem gz cpu secs C# .NET #8 2.14 30,496 1473 8.33 C# .NET #9 8.06 31,844 1225 31.90 F# .NET #6 8.33 106,496 1097 32.25 C# .NET #6 9.16 30,572 1068 36.34 F# .NET #5 9.75 111,368 912 38.19 C# .NET #7 Bad Output n-body source secs mem gz cpu secs C# .NET #9 3.14 30,200 2467 3.13 C# .NET #4 3.78 30,120 2125 3.76 C# .NET #7 4.79 30,184 1704 4.78 C# .NET #6 4.81 30,192 1742 4.80 F# .NET #6 5.02 108,192 1383 5.00 C# .NET #3 6.89 30,564 1305 6.87 F# .NET #3 6.91 106,624 1617 6.90 C# .NET #8 7.13 30,596 1332 7.12 C# .NET #2 7.14 30,532 1343 7.12 F# .NET #2 7.28 108,408 1381 7.26 F# .NET #4 7.40 108,620 1290 7.38 F# .NET #5 7.47 108,388 1351 7.45 F# .NET Bad Output spectral-norm source secs mem gz cpu secs C# .NET #5 0.90 34,704 764 3.27 C# .NET #3 1.54 32,804 878 5.84 F# .NET #4 1.60 110,572 732 5.86 F# .NET #2 1.63 109,184 853 5.90 mandelbrot source secs mem gz cpu secs C# .NET 3.17 65,512 1974 12.37 C# .NET #9 3.17 65,492 816 12.37 F# .NET #6 3.83 140,068 933 14.86 F# .NET 4.08 140,580 877 15.88 F# .NET #5 4.09 139,916 897 15.90 C# .NET #5 4.12 63,172 839 16.13 pidigits source secs mem gz cpu secs C# .NET #6 0.94 31,888 1168 0.92 C# .NET #5 0.93 33,596 977 0.94 F# .NET #6 0.99 105,584 905 0.98 C# .NET #4 1.35 31,700 1121 1.34 F# .NET #4 1.39 106,688 874 1.39 C# .NET #7 6.72 53,020 567 7.28 regex-redux source secs mem gz cpu secs C# .NET #8 1.44 389,260 1869 2.67 F# .NET #6 2.45 1,131,324 611 5.76 C# .NET #5 2.50 1,056,900 673 5.81 F# .NET #7 4.66 1,325,080 599 6.52 fasta source secs mem gz cpu secs F# .NET #3 1.16 137,720 1350 4.13 F# .NET #4 1.29 201,344 1342 4.54 C# .NET #5 1.49 52,708 1691 5.45 C# .NET 1.57 51,912 2098 5.78 k-nucleotide source secs mem gz cpu secs C# .NET 3.60 184,024 2044 11.81 F# .NET #6 4.11 260,772 1907 12.92 C# .NET #6 5.98 190,172 1603 15.84 F# .NET #2 4.54 272,540 1926 15.96 reverse-complement source secs mem gz cpu secs C# .NET #8 0.55 926,208 2637 1.26 C# .NET #5 2.81 1,025,440 1613 3.76 C# .NET #6 1.58 1,026,664 1621 3.78 C# .NET #7 1.92 954,396 1310 5.06 F# .NET #4 Timed Out F# .NET #5 Timed Out binary-trees source secs mem gz cpu secs C# .NET #7 4.83 1,605,316 694 15.63 C# .NET #2 4.90 1,757,904 705 15.94 F# .NET #7 5.39 1,718,280 516 16.69 C# .NET #3 5.25 2,092,160 676 16.83 C# .NET 5.28 2,145,644 657 17.22 F# .NET .NET SDK 7.0.102 Host Version: 7.0.2 Commit: d037e070eb <ServerGarbageCollection>true C# .NET .NET SDK 7.0.200 Host Version: 7.0.3 Commit: 0a2bda10e8 <ServerGarbageCollection>true all F# .NET programs & measurements all C# .NET programs & measurements