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. pidigits source secs mem gz busy cpu load C# .NET Core 1.86 33,240 1168 2.35 2% 20% 5% 99% C++ g++ 1.82 4,312 513 1.87 1% 1% 2% 100% fannkuch-redux source secs mem gz busy cpu load C# .NET Core 11.41 32,388 1225 45.24 99% 100% 99% 99% C++ g++ 10.71 1,708 980 42.33 100% 96% 100% 100% spectral-norm source secs mem gz busy cpu load C# .NET Core 2.16 35,800 764 8.21 94% 93% 99% 94% C++ g++ 1.99 2,408 1044 7.89 99% 99% 99% 99% fasta source secs mem gz busy cpu load C# .NET Core 1.69 75,044 1691 6.28 90% 91% 96% 95% C++ g++ 1.46 2,024 2711 4.40 75% 76% 75% 76% k-nucleotide source secs mem gz busy cpu load C# .NET Core 5.63 184,992 2044 19.00 80% 88% 96% 73% C++ g++ 3.88 156,164 1631 12.09 72% 92% 71% 77% binary-trees source secs mem gz busy cpu load C# .NET Core 5.77 844,952 753 20.47 93% 87% 89% 86% C++ g++ 3.96 113,236 809 12.86 74% 84% 98% 69% regex-redux source secs mem gz busy cpu load C# .NET Core 2.82 365,156 1869 4.97 27% 86% 26% 38% C++ g++ 1.86 203,856 1315 4.49 99% 50% 48% 44% reverse-complement source secs mem gz busy cpu load C# .NET Core 3.16 1,029,156 1621 7.90 57% 77% 63% 53% C++ g++ 1.89 499,672 2093 1.94 100% 2% 1% 1% n-body source secs mem gz busy cpu load C# .NET Core 21.74 34,000 1305 22.85 0% 0% 32% 73% C++ g++ 7.70 1,612 1879 7.81 100% 0% 1% 1% mandelbrot source secs mem gz busy cpu load C# .NET Core 5.60 65,320 816 22.00 98% 97% 99% 99% C++ g++ 1.51 26,256 1791 6.01 100% 99% 99% 99% C# .NET Core .NET Core SDK 3.1.201 Host Version: 3.1.3; Commit: 4a9f85e9f8 <ServerGarbageCollection>true <ConcurrentGarbageCollection>true C++ g++ g++ (Ubuntu 9.3.0-10ubuntu2) 9.3.0 all C# .NET Core programs & measurements all C++ g++ programs & measurements