通过multipartform上传C＃文件对大文件来说速度极慢

Question

下面有什么问题？它需要大约2.5小时才能上传2gb文件。通过基于网络的客户端，它花了10分钟做同样的事情。我究竟做错了什么？我怎样才能加快速度呢？感谢。

public static async Task UploadFile(string path)
{

    HttpClient httpClient = new HttpClient();
    MultipartFormDataContent form = new MultipartFormDataContent();

    httpClient.Timeout = Timeout.InfiniteTimeSpan;

    FileInfo fileInfo = new FileInfo(path);
    FileStream fileStream = new FileStream(path, FileMode.Open, FileAccess.Read);
    StreamContent streamContent = new StreamContent(fileStream);

    HttpResponseMessage m = new HttpResponseMessage();

    form.Add(streamContent, path.Substring(0, path.Length-4), path);

    try
    {
        m = await httpClient.PostAsync(@"https://xxxxx/api/DataObjects/addAFile?access_token=" + Token, form);
    }
    catch (Exception ex)
    {
        throw new Exception("Failed to Post Upload File Request:\n" + @"https://xxxxx/api/DataObjects/addAFile?access_token=" + Token + "\nMessage: " + ex.Message);
    }
    httpClient.Dispose();
}

这是内存问题吗？将文件编码为流的问题？