Test proc speed

ParallelTest.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;

namespace ConsoleApp8
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            Console.WriteLine("Starting Non-Parallel Test\n");

            List<double> nonParallelTimes = new List<double>();

            for (int i = 1; i < 6; i++)
            {
                nonParallelTimes.Add(DoNonParallelTest(i));
            }

            Console.WriteLine($"The average non-parallel run time was: {nonParallelTimes.Average()}");

            Console.WriteLine("Starting Parallel Test\n");

            List<double> parallelTimes = new List<double>();

            for (int i = 1; i < 6; i++)
            {
                parallelTimes.Add(DoParallelTest(i));
            }

            Console.WriteLine($"The average parallel run time was: {parallelTimes.Average()}");
        }

        private static double DoNonParallelTest(int run)
        {
            Console.WriteLine($"Starting Run #{run}");

            long fromInc = 0;
            long toEx = 300000000;

            Stopwatch stopWatch = Stopwatch.StartNew();
            for (long i = fromInc; i < toEx; i++)
            {
                if (Math.Abs(i % 3.1415927) < 0.0001) { }
            }
            stopWatch.Stop();

            TimeSpan ts = stopWatch.Elapsed;
            double time = Convert.ToDouble($"{ts.Seconds}.{ts.Milliseconds}");

            Console.WriteLine($"Ending Run #{run} with elapsed time of {time}");

            return time;
        }

        private static double DoParallelTest(int run)
        {
            Console.WriteLine($"Starting Run #{run}");

            long fromInc = 0;
            long toEx = 2000000000;

            Stopwatch stopWatch = Stopwatch.StartNew();
            Parallel.For(fromInc, toEx, (i) =>
            {
                if (Math.Abs(i % 3.1415927) < 0.0001) { }
            });
            stopWatch.Stop();

            TimeSpan ts = stopWatch.Elapsed;
            double time = Convert.ToDouble($"{ts.Seconds}.{ts.Milliseconds}");

            Console.WriteLine($"Ending Run #{run} with elapsed time of {time}");

            return time;
        }
    }
}