using Serilog;
using Serilog.Sinks.SystemConsole.Themes;
using System;
using System.IO;
namespace serilog
{
    class Program
    {
        static void Main(string[] args)
        {
           Log.Logger = new LoggerConfiguration()
           .WriteTo.Console()
           .WriteTo.File("log.txt")
           .CreateLogger();
           DateTime start = DateTime.MinValue;
           DateTime end = DateTime.MinValue;
           double delta = 0.0;
           for(int x=0;x<=10;x++)
           {
              start = DateTime.Now;
              Log.Information($"SIMPLE TEXT");
              end = DateTime.Now;
              delta = end.Subtract(start).TotalMilliseconds;
              Console.WriteLine($"============> It takes [{delta}] to print SnapShot number {x}");
           }
           Log.CloseAndFlush();
        }
    }
}

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>netcoreapp3.1</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
    <PackageReference Include="Serilog.Sinks.Async" Version="1.4.0" />
    <PackageReference Include="Serilog" Version="2.10.0-dev-01226" />
    <PackageReference Include="Serilog.Sinks.Console" Version="4.0.0-dev-00839" />
    <PackageReference Include="Serilog.Sinks.File" Version="5.0.0-dev-00887" />
  </ItemGroup>
 </Project>