SimplePerfTest

Program.cs

using ImageSharp;
using System;
using System.Diagnostics;
using System.Drawing;
using System.IO;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            var sw = new Stopwatch();
            for (int i = 0; i < 50; i++)
            {
                sw.Restart();
                RenderGdi();
                sw.Stop();
                Console.WriteLine("GDI:        " + sw.Elapsed);
                sw.Restart();
                RenderSharp();
                sw.Stop();
                Console.WriteLine("ImageSharp: " + sw.Elapsed);
                Console.WriteLine();
            }
            Console.Read();
        }

        private static void RenderGdi()
        {
            using (var img = new Bitmap(400, 400))
            {
                using (var graphics = Graphics.FromImage(img))
                {
                    graphics.Clear(Color.Black);
                    System.Drawing.Rectangle rect = new System.Drawing.Rectangle(img.Width / 2 - 50, img.Height / 2 - 25, 100, 50);
                    graphics.FillRectangle(Brushes.Red, rect);
                }
            }
        }

        private static void RenderSharp()
        {
            using (var img = new Image<Rgba32>(400, 400))
            {
                img.Fill(Rgba32.Black);
                var sRect = new ImageSharp.Rectangle(img.Width / 2 - 50, img.Height / 2 - 25, 100, 50);
                img.Fill(Rgba32.Red, sRect);
            }
        }
    }
}

BenchmarkDotNet=v0.10.6, OS=Windows 10 Redstone 1 (10.0.14393)
Processor=Intel Xeon CPU E5-2667 0 2.90GHz, ProcessorCount=4
Frequency=10000000 Hz, Resolution=100.0000 ns, Timer=UNKNOWN
  [Host]     : Clr 4.0.30319.42000, 32bit LegacyJIT-v4.6.1648.0
  DefaultJob : Clr 4.0.30319.42000, 32bit LegacyJIT-v4.6.1648.0

Method	Mean	Error	StdDev
RenderGdi	767.8 us	36.62 us	107.4 us
RenderSharp	12,655.2 us	238.32 us	199.0 us

BenchmarkDotNet=v0.10.6, OS=Windows 10 Redstone 1 (10.0.14393)
Processor=Intel Xeon CPU E5-2667 0 2.90GHz, ProcessorCount=4
Frequency=10000000 Hz, Resolution=100.0000 ns, Timer=UNKNOWN
  [Host]     : Clr 4.0.30319.42000, 32bit LegacyJIT-v4.7.2053.0
  DefaultJob : Clr 4.0.30319.42000, 32bit LegacyJIT-v4.7.2053.0

Method	Mean	Error	StdDev	Median
RenderGdi	821.2 us	40.64 us	119.18 us	820.2 us
RenderSharp	11,582.6 us	231.40 us	507.92 us	11,672.2 us
RenderSkia	537.4 us	20.81 us	61.05 us	554.0 us