GameWindow Timing Issue

using System;
using System.Drawing;
using System.Diagnostics;
using OpenTK;
using OpenTK.Graphics;
 
namespace OpenTKTest
{
	class Program : GameWindow
	{
		private Random random;
		private double nextTime, currentTime;
		private int r, g, b;
 
		public Program() : base(640, 480)
		{
			random = new Random();
		}
 
		public override void OnLoad(EventArgs e)
		{
		}
 
		public override void OnUpdateFrame(UpdateFrameEventArgs e)
		{
			currentTime += e.Time;
 
			if (currentTime > nextTime)
			{
				nextTime =currentTime + 1;
				r = random.Next(0, 254);
				g = random.Next(0, 254);
				b = random.Next(0, 254);
				Trace.WriteLine(String.Format("Check on:\t {0}", currentTime.ToString()));
			}
 
		}
 
 
		public override void OnRenderFrame(RenderFrameEventArgs e)
		{
			GL.ClearColor(Color.FromArgb(255, r, g, b));
			GL.Clear(ClearBufferMask.ColorBufferBit);
			SwapBuffers();
		}
 
 
		public static void Main(string[] args)
		{
			using (Program program = new Program())
			{
				program.Run();
			}
		}
	}
}

...
Check on:	 14,8649442999998
Check on:	 15,8650569999998
Check on:	 16,8651670999993
Check on:	 18,2261955999991
Check on:	 19,2262548999984
Check on:	 20,226323599998
Check on:	 21,2263256999972
Check on:	 22,502357799997
Check on:	 23,502364599998
Check on:	 24,502434599999
Check on:	 26,3859432999997
Check on:	 27,3859854000009
Check on:	 28,3860231000013
Check on:	 29,3860308000011
Check on:	 30,3860916000009