private static void CopyDir(DirectoryInfo s, DirectoryInfo d)
{
    if (!d.Exists)
        d.Create();
    Parallel.Invoke(
        () =>
        {
            Parallel.ForEach(s.GetFiles(), f =>
                {
                    var t = new FileInfo(Path.Combine(d.FullName, f.Name));
                    f.CopyTo(t.FullName);
                    Total++;
                });
        },
        () =>
        {
            Parallel.ForEach(s.GetDirectories(), subs =>
              {
                  var subd = new DirectoryInfo(Path.Combine(d.FullName, subs.Name));
                  CopyDir(subs, subd);
              });
        });
}

private static TimeSpan Test()
{
    var w = new Stopwatch();
    w.Start();
    CopyDir(new DirectoryInfo("e:\\test"), new DirectoryInfo("e:\\test1"));
    w.Stop();
    return w.Elapsed;
}