C# .NET Core versus C++ g++ 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. fannkuch-redux source secs mem gz busy cpu load C# .NET Core 11.12 32,008 1225 44.12 99% 99% 99% 99% C++ g++ 10.70 1,864 980 42.31 96% 100% 100% 100% spectral-norm source secs mem gz busy cpu load C# .NET Core 2.13 36,024 764 8.11 93% 98% 95% 93% C++ g++ 1.98 2,320 1044 7.90 99% 100% 99% 100% pidigits source secs mem gz busy cpu load C# .NET Core 2.03 37,336 973 2.13 3% 1% 100% 0% C++ g++ 1.89 4,460 513 1.95 2% 0% 100% 1% fasta source secs mem gz busy cpu load C# .NET Core 1.66 79,592 1691 6.03 96% 88% 88% 91% C++ g++ 1.46 2,180 2711 4.39 75% 75% 75% 75% regex-redux source secs mem gz busy cpu load C# .NET Core 2.18 292,196 1869 4.28 23% 83% 43% 48% C++ g++ 1.85 203,748 1315 4.44 48% 100% 43% 48% binary-trees source secs mem gz busy cpu load C# .NET Core 5.59 905,364 753 20.01 92% 88% 87% 91% C++ g++ 3.93 113,768 809 12.78 70% 81% 75% 98% k-nucleotide source secs mem gz busy cpu load C# .NET Core 5.61 185,068 2044 18.05 77% 82% 70% 93% C++ g++ 3.89 156,148 1631 11.99 94% 74% 70% 71% reverse-complement source secs mem gz busy cpu load C# .NET Core 3.12 1,028,260 1621 7.66 75% 77% 53% 41% C++ g++ 1.88 499,844 2093 1.93 100% 1% 2% 0% n-body source secs mem gz busy cpu load C# .NET Core 21.75 34,648 1305 22.06 0% 41% 59% 1% C++ g++ 7.70 1,772 1879 8.02 4% 0% 0% 100% mandelbrot source secs mem gz busy cpu load C# .NET Core 5.54 65,288 816 21.79 98% 100% 98% 98% C++ g++ 1.51 25,708 1791 6.01 99% 99% 99% 100% C# .NET Core .NET Core SDK 3.1.101 Host Version: 3.1.2; Commit: 916b5cba26 <ServerGarbageCollection>true <ConcurrentGarbageCollection>true C++ g++ g++ (Ubuntu 9.2.1-9ubuntu2) 9.2.1 20191008 all C# .NET Core programs & measurements all C++ g++ programs & measurements