从 xamarin 将文件上传到 Web api 服务器 - 请求处理时间太长

我正在使用 HttpClient 将二进制文件发布到 Azure 托管的服务器。对于大小不太大的文件，该请求需要很长时间才能传递。有时，当客户端因超时而取消任务时，服务器会收到请求。我使用以下代码异步上传数据：

public async Task<HttpResponseMessage> UploadFile(byte[] file)
{
    videoThumbName = Guid.NewGuid().ToString();
    var progress = new System.Net.Http.Handlers.ProgressMessageHandler();

    progress.HttpSendProgress += progress_HttpSendProgress;

    using (var client = HttpClientFactory.Create(progress))
    {
        client.BaseAddress = new Uri(GlobalVariables.host);

        // Set the Accept header for BSON.
        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(
                new MediaTypeWithQualityHeaderValue("application/bson"));

        var request = new uploadFileModel { data = file, dateCreated = DateTime.Now, fileName = fileName, username = loggedUser, VideoThumbName = videoThumbName};

        // POST using the BSON formatter.
        MediaTypeFormatter bsonFormatter = new BsonMediaTypeFormatter();
        var m = client.MaxResponseContentBufferSize;
        var result = await client.PostAsync("api/media/upload", request, bsonFormatter);

        return result.EnsureSuccessStatusCode();
    }
}

服务器端代码如下所示（为了简洁起见，我留下了一些代码）：

[HttpPost]
[Route("upload")]
public async Task<HttpResponseMessage> Upload(uploadFileModel model)
{
    var result = new HttpResponseMessage(HttpStatusCode.OK);

    if (ModelState.IsValid)
    {
        string thumbname = model.VideoThumbName;
        string tempPath = HttpContext.Current.Server.MapPath("~/video");
        string sourceFilePath = Path.Combine(HttpContext.Current.Server.MapPath("~/video"), model.fileName);
        string pathToThumbs = Path.Combine(HttpContext.Current.Server.MapPath("~/contents/member/" + model.username + "/thumbs"), thumbname + ".jpg");
        string finalPath = Path.Combine(HttpContext.Current.Server.MapPath("~/contents/member/" + model.username + "/flv"), model.fileName);
        string thumbPath = HttpContext.Current.Server.MapPath("~/contents/member/" + model.username + "/thumbs");
        string vidDuration = "";
        string videoDurationSec = "";

        int maxWidth = 380;
        int maxHeight = 360;

        try
        {
            File.WriteAllBytes(sourceFilePath, model.data);
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }

        var ffMpegThumb = new NReco.VideoConverter.FFMpegConverter();

        ffMpegThumb.GetVideoThumbnail(sourceFilePath, pathToThumbs);

        var ffmpegVid = new NReco.VideoConverter.FFMpegConverter();

        ffmpegVid.ConvertMedia(sourceFilePath, Format.mp4, finalPath, Format.mp4, new ConvertSettings() { VideoCodec = "h264" });

        return result;
    }
    else
    {
        throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.NotAcceptable, "This request is not properly formatted"));
    }

}

是否有可能是因为我的互联网连接请求延迟了？我发送的文件大小甚至没有那么大，它们的大小约为 1-2 mbs。我想知道更大的文件需要多长时间。 我可以改进这个过程吗？