static void Main(string[] args)
        {
            var vals = new string[0x4000_000];

            var watch = Stopwatch.StartNew();
            var random = new Random(0);
            for (var i = 0; i < vals.Length; i++)
            {
                vals[i] = random.Next().ToString();
            }

            watch.Stop();
            Console.WriteLine($"Init: {watch.Elapsed.TotalSeconds}");

            TestPerformanceManaged(vals);
        }

        static void TestPerformanceManaged(string[] vals)
        {
            var watch = Stopwatch.StartNew();

            var res = 0L;

            foreach (var val in vals)
            {
                var num = int.Parse(val);
                res += num;
            }

            Trace.WriteLine(res);

            watch.Stop();
            Console.WriteLine($"TestPerformanceManaged: {watch.Elapsed.TotalSeconds}");
        }

#include <iostream>
#include <vector>
#include <string>
#include <chrono>

std::vector<std::wstring> MakeIntSequence(int size)
{
   std::vector<std::wstring> v;
   v.reserve(size);
   for (int i = 0; i < size; ++i)
   {
      const int number = (rand() * (RAND_MAX + 1) + rand()) * 2 + 1;
      v.push_back(std::to_wstring(number));
   }
   return v;
}

int main()
{
   namespace tm = std::chrono;

   const auto vals = MakeIntSequence(10000000);

   const auto t0 = tm::steady_clock::now();

   int hash{};
   for (const auto& val : vals)
   {
      hash ^= std::stoi(val);
   }
   const auto dt = tm::duration_cast<tm::milliseconds>(tm::steady_clock::now() - t0);

   std::cout << "Hash = " << hash << std::endl;
   std::cout << "Processing time: " << dt.count() << "ms" << std::endl;
}