Java 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 2.23 31,164 1485 8.60 C# .NET #2 29.55 30,468 584 29.52 C# .NET #6 8.65 30,684 1075 34.32 C# .NET #9 9.07 32,108 1232 35.94 Java #3 40.76 42,844 1264 40.83 Java 10.98 42,812 1289 43.36 Java #2 44.03 40,916 520 44.09 C# .NET #3 11.39 30,804 1117 44.78 C# .NET #7 Bad Output n-body source secs mem gz cpu secs C# .NET #9 3.16 30,044 2480 3.15 C# .NET #4 3.79 30,088 2137 3.77 C# .NET #7 4.79 30,216 1715 4.77 C# .NET #6 4.82 30,196 1754 4.80 C# .NET #3 6.64 31,212 1311 6.62 C# .NET #2 6.82 31,168 1350 6.81 C# .NET #8 6.82 31,208 1339 6.81 Java #5 6.78 41,384 1435 6.82 Java #4 6.87 41,188 1495 6.91 Java #2 7.42 41,308 1430 7.46 Java #3 7.47 41,256 1436 7.51 C# .NET 7.79 31,240 1424 7.77 Java 7.85 41,512 1437 7.89 spectral-norm source secs mem gz cpu secs C# .NET #5 0.93 36,020 776 3.34 C# .NET 5.39 31,320 480 5.38 C# .NET #2 1.51 31,432 1084 5.75 C# .NET #3 1.56 33,348 890 5.85 Java #3 1.66 42,924 762 6.21 Java 7.07 42,268 521 7.13 Java #2 2.40 42,164 956 9.25 mandelbrot source secs mem gz cpu secs C# .NET 3.23 66,812 1980 12.56 C# .NET #9 3.23 66,560 822 12.59 C# .NET #5 4.02 64,276 851 15.75 Java #4 4.45 104,488 667 16.20 Java #2 4.13 83,152 802 16.22 Java #6 4.28 83,056 808 16.84 Java 25.70 41,388 671 25.76 C# .NET #3 6.80 64,652 722 26.77 Java #3 7.86 83,424 910 30.96 C# .NET #2 45.95 31,572 504 45.90 pidigits source secs mem gz cpu secs C# .NET #5 0.92 34,692 990 0.94 C# .NET #6 0.96 32,836 1182 0.94 Java #3 0.93 40,860 770 0.96 C# .NET #4 1.36 33,556 1135 1.35 Java #2 1.34 44,524 944 1.42 C# .NET #7 6.49 53,064 579 7.05 Java 7.61 486,236 807 8.69 regex-redux source secs mem gz cpu secs C# .NET #8 1.36 388,756 1881 2.60 C# .NET 4.58 847,156 641 4.81 C# .NET #5 2.07 861,292 679 6.28 Java 8.38 666,804 875 16.42 Java #3 5.17 671,372 935 17.04 Java #6 5.57 1,234,928 746 17.17 C# .NET #4 13.01 960,932 854 43.92 fasta source secs mem gz cpu secs Java #4 3.15 42,784 1528 3.26 Java #6 1.18 48,408 2549 3.71 Java #5 1.24 48,752 2478 3.81 Java #2 4.35 47,184 1259 4.50 C# .NET #5 1.48 49,500 1702 5.38 C# .NET 1.83 52,060 2113 6.61 k-nucleotide source secs mem gz cpu secs C# .NET #6 4.89 187,780 1615 12.63 Java 5.01 368,104 1821 16.33 Java #6 7.18 365,592 1614 25.01 Java #3 7.30 365,348 1642 25.39 Java #4 34.43 195,584 1887 34.79 Java #5 16.05 219,872 2225 38.17 C# .NET #7 40.42 762,076 1449 40.86 C# .NET #4 11.44 777,216 1725 41.13 C# .NET Make Error reverse-complement source secs mem gz cpu secs C# .NET #8 0.55 718,428 2641 1.30 C# .NET 2.96 798,072 1130 3.12 C# .NET #5 2.60 1,026,320 1620 3.58 C# .NET #6 1.58 1,027,952 1627 3.80 Java #6 3.33 2,031,460 760 3.96 C# .NET #7 1.53 942,900 1312 4.16 Java #5 4.73 1,096,344 1115 4.86 Java #4 5.57 1,889,928 656 5.68 Java #7 23.06 1,036,296 1654 6.31 C# .NET #3 7.33 1,572,192 934 11.43 Java #3 Bad Output Java #8 Bad Output binary-trees source secs mem gz cpu secs Java #4 4.50 2,081,744 846 5.22 Java #3 4.80 2,076,860 546 5.59 Java #6 4.84 2,097,072 535 5.60 Java #2 4.93 2,067,656 558 5.67 Java #7 2.57 1,728,452 841 8.00 C# .NET #2 4.48 1,624,564 717 14.25 C# .NET #7 4.54 1,608,796 706 14.53 C# .NET #3 4.84 2,089,712 688 15.89 C# .NET 5.08 2,046,692 668 16.32 Java java 22 2024-03-19 Java HotSpot(TM) 64-Bit Server VM (build 22+36-2370, mixed mode, sharing) C# .NET .NET SDK 8.0.200 Host Version: 8.0.2 Commit: 1381d5ebd2 <ServerGarbageCollection>true all Java programs & measurements all C# .NET programs & measurements