Sorry, I can't seem to edit my answer anymore, but I was mistaken, C# version is using AOT. But the are other significant differences here: > var rounds = in

Sorry, I can't seem to edit my answer anymore, but I was mistaken, C# version is using AOT. But the are other significant differences here: > var rounds = int.Parse(File.ReadAllText("rounds.txt")); > var pi = 1.0D; > var x = 1.0D; > for (var i = 2; i < rounds + 2; i++) { > x = -x; > pi += x / (2 \* i - 1); > } > pi \*= 4; > Console.WriteLine(pi); For example, if we change the type of 'rounds' variable here from int to double (like it is also in Go version), the code runs significantly faster on my machine.