C# – AES解密性能缓慢

我正在尝试创建一个循环文件??夹的播放器解密图像并在图像框中显示(以合理的速度)

重要的是,我不希望将文件解密到驱动器然后播放.我想只在内存中解密它们.

目前,每个图像(帧)的解密大约需要100ms.但是如果可能的话,我想尝试将其降低到大约10毫秒.

以上是在3.0ghz的iCore7上进行了描述

目前我正在UI线程上运行所有内容.我想也许如果我多线程解密我可能得到我想要的速度,那么我将不得不在内存中存储很多.但我宁愿看看我是否可以更快地进行实际的解密.

这是解密功能：

private byte[] DecryptFile(string inputFile,string skey)
{

MemoryStream output1 = new MemoryStream();

// ok for tests..
Rfc2898DeriveBytes k2 = new Rfc2898DeriveBytes(skey,new byte[] { 10,10,10 });

try
{
    using (RijndaelManaged aes = new RijndaelManaged())
    {
        byte[] key = k2.GetBytes(16);

        /* This is for demostrating purposes only. 
         * Ideally yu will want the IV key to be different from your key and you should always generate a new one for each encryption in other to achieve maximum security*/
        byte[] IV =  k2.GetBytes(16);

        byte[] cript = File.ReadAllBytes(inputFile);


        using (MemoryStream fsCrypt = new MemoryStream(cript))
        {

                using (ICryptoTransform decryptor = aes.CreateDecryptor(key,IV))
                {
                    using (CryptoStream cs = new CryptoStream(fsCrypt,decryptor,CryptoStreamMode.Read))
                    {
                        cs.CopyTo(output1);
                    }
            }
        }
    }
}
catch (Exception ex)
{
    MessageBox.Show(ex.Message);
}

return output1.ToArray() ;
}

有没有比上述功能更有效的解密方法？