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    <p>As ChrisBint suggested, use a parallel loop.</p> <p>I created three methods to write the files (code below). One uses your code above, one uses File.WriteAllBytes(...) - both these use a traditional for loop.</p> <p>The third implementation used a parallel for loop.</p> <p>Here are the times to create 1000 files:</p> <blockquote> <p>FileStream: 2658ms</p> <p>File.WriteAllBytes: 2555ms </p> <p>Parallel.For: 617ms</p> </blockquote> <p>So the parallel loop is four times faster than the slowest implementation. Obviously this will vary on different hardware, and your results will depend very much on your CPU and disk.</p> <p>Here's the code:</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; using System.Diagnostics; using System.Threading.Tasks; namespace FileCreator { class Program { static void Main(string[] args) { string folder = @"d:\temp"; Clean(folder); CreateWithParallelFileWriteBytes(folder); Clean(folder); CreateWithFileStream(folder); Clean(folder); CreateWithFileWriteBytes(folder); } private static void Clean(string folder) { if (Directory.Exists(folder)) { Directory.Delete(folder, true); } Directory.CreateDirectory(folder); } private static byte[] GetFileContent(int i) { Random r = new Random(i); byte[] buffer = new byte[1024]; r.NextBytes(buffer); return buffer; } private static void CreateWithFileStream(string folder) { var sw = new Stopwatch(); sw.Start(); for (int i = 0; i &lt; 1000; i++) { string path = Path.Combine(folder, string.Format("file{0}.dat", i)); using (var fs = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.None, 4096, FileOptions.None)) { byte[] bytes = GetFileContent(i); fs.Write(bytes, 0, bytes.Length); } } Console.WriteLine("Time for CreateWithFileStream: {0}ms", sw.ElapsedMilliseconds); } private static void CreateWithFileWriteBytes(string folder) { var sw = new Stopwatch(); sw.Start(); for (int i = 0; i &lt; 1000; i++) { string path = Path.Combine(folder, string.Format("file{0}.dat", i)); File.WriteAllBytes(path, GetFileContent(i)); } Console.WriteLine("Time for CreateWithFileWriteBytes: {0}ms", sw.ElapsedMilliseconds); } private static void CreateWithParallelFileWriteBytes(string folder) { var sw = new Stopwatch(); sw.Start(); Parallel.For(0, 1000, (i) =&gt; { string path = Path.Combine(folder, string.Format("file{0}.dat", i)); File.WriteAllBytes(path, GetFileContent(i)); }); Console.WriteLine("Time for CreateWithParallelFileWriteBytes: {0}ms", sw.ElapsedMilliseconds); } } } </code></pre>
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    1. COIs there a change in the times if you run the parallel version first? The createfile is sometimes faster if the file is already on disk.
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    2. CODoesn't seem to affect the times. It's still ~600ms for the parallel version.
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    3. COI've updated to code so it deletes the output folder between each test to make things fairer. The times are much the same (2715ms/2608ms/602ms).
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