brotli vs deflate

gistfile1.txt

using System.Diagnostics;
using System.IO;
using System.IO.Compression;

namespace compressionspeed
{
    internal class Program
    {
        static TimeSpan last = TimeSpan.Zero;
        static long lastSize = 0;

        static void Main(string[] args)
        {
            Console.WriteLine("vs Zip with Optimal compression level (large dll)");
            DoTest(CompressionLevel.Optimal, false);
            DoTest(CompressionLevel.Optimal, false, baseline:true) ;

            DoTest(CompressionLevel.NoCompression);
            DoTest(CompressionLevel.Fastest);
            DoTest(CompressionLevel.Optimal);
            DoTest(CompressionLevel.SmallestSize);

            Console.WriteLine();

            DoTest2(CompressionLevel.Optimal, false);



            DoTest2(CompressionLevel.NoCompression);
            DoTest2(CompressionLevel.Fastest);
            DoTest2(CompressionLevel.Optimal);
            DoTest2(CompressionLevel.SmallestSize);

        }

        static void DoTest(CompressionLevel cl, bool print = true, bool baseline = false)
        {
            Directory.CreateDirectory(@"c:\tempzip");

            var dest = Path.Combine(@"c:\tempzip", Path.GetRandomFileName() + Enum.Format(typeof(CompressionLevel), cl, "g"));
            Stopwatch sw = Stopwatch.StartNew();
            try
            {
                //ZipFile.(@"c:\tempzip\enwiki8", dest, cl, includeBaseDirectory: false);
                using (ZipArchive zip = ZipFile.Open(dest, ZipArchiveMode.Create))
                {
                    zip.CreateEntryFromFile(@"c:\tempzip\WindowsCodecsRaw.dll", "data/path/something.txt", cl);
                }
            }
            finally
            {
                sw.Stop();

                TimeSpan @this = sw.Elapsed;
                long size = new FileInfo(dest).Length;

                if (baseline)
                {
                    last = @this; lastSize = size;
                }

                if (print)
                {
                    Console.Write($"{cl,20}: ");
                    Console.Write($"ZIP {Math.Round((double)(size - lastSize) / lastSize * 100, 0)} % size");
                    Console.WriteLine($" {Math.Round((@this - last) / last * 100, 0)} % speed");
                }

                File.Delete(dest);
            }
        }

        static void DoTest2(CompressionLevel cl, bool print = true)
        {
            Directory.CreateDirectory(@"c:\tempzip");

            var dest = Path.Combine(@"c:\tempzip", Path.GetRandomFileName() + Enum.Format(typeof(CompressionLevel), cl, "g"));
            Stopwatch sw = Stopwatch.StartNew();
            try
            {
                using (FileStream input = File.OpenRead(@"c:\tempzip\WindowsCodecsRaw.dll"))
                using (FileStream output = File.Create(dest))
                using (BrotliStream compressor = new BrotliStream(output, cl))
                {
                    input.CopyTo(compressor);
                }
            }
            finally
            {
                sw.Stop();

                TimeSpan @this = sw.Elapsed;
                long size = new FileInfo(dest).Length;
                if (print)
                {
                    Console.Write($"{cl,20}: ");
                    Console.Write($"BROTLI {Math.Round((double)(size - lastSize) / lastSize * 100, 0), 4} % size");
                    Console.WriteLine($" {Math.Round((@this - last) / last * 100, 0), 4} % speed");
                }

                File.Delete(dest);
            }
        }
    }
}