.NET Fiddle

CSharp · Console

/Program.cs

using System;
using System.Text;
using System.Threading.Tasks;
using System.Diagnostics;
using System.Collections.Generic;
					
public class Program
{
	public static void Main()
	{
		var byteList = new List<byte>();
		FillList(byteList);
		var byteList1 = new List<byte>(300);
		FillList(byteList1);
		var byteList11 = new List<byte>(600);
		FillList(byteList11);
	}
	
	private static void FillList(List<byte> list)
	{
		var stopwatch = Stopwatch.StartNew();
		for(var i=0;i<300;i++)
		{
			list.Add(0);
		}
		
		stopwatch.Stop();
		Console.WriteLine(stopwatch.Elapsed);
		
		/*
		LAST RUN:
		00:00:00.0000065
		00:00:00.0000037
		00:00:00.0000035
		*/
	}
}
;