fileCopy.cs

// FROM http://www.codeproject.com/Tips/777322/A-Faster-File-Copy
/// <summary> Time the Move
/// </summary> 
/// <param name="source">Source file path</param> 
/// <param name="destination">Destination file path</param> 
public static void MoveTime (string source, string destination)
{
    DateTime start_time = DateTime.Now;
    FMove (source, destination);
    long size = new FileInfo (destination).Length;
    int milliseconds = 1 + (int) ((DateTime.Now - start_time).TotalMilliseconds);
    // size time in milliseconds per hour
    long tsize = size * 3600000 / milliseconds;
    tsize = tsize / (int) Math.Pow (2, 30);
    Console.WriteLine (tsize + "GB/hour");
}

/// <summary> Fast file move with big buffers
/// </summary>
/// <param name="source">Source file path</param> 
/// <param name="destination">Destination file path</param> 
static void FMove (string source, string destination)
{
    int array_length = (int) Math.Pow (2, 19);
    byte[] dataArray = new byte[array_length];
    using (FileStream fsread = new FileStream 
    (source, FileMode.Open, FileAccess.Read, FileShare.None, array_length))
    {
        using (BinaryReader bwread = new BinaryReader (fsread))
        {
            using (FileStream fswrite = new FileStream 
            (destination, FileMode.Create, FileAccess.Write, FileShare.None, array_length))
            {
                using (BinaryWriter bwwrite = new BinaryWriter (fswrite))
                {
                    for (; ; )
                    {
                        int read = bwread.Read (dataArray, 0, array_length);
                        if (0 == read)
                            break;
                        bwwrite.Write (dataArray, 0, read);
                    }
                }
            }
        }
    }
    File.Delete (source);
}