HttpClient GetAsync taking ~2 seconds

Question

My wpf program reads commands from a text file, and then sends those commands out over HttpClient. Each GetAsync response takes about 2 seconds to complete. This seems excessively long, especially when I have 50 commands to send.

Is this a normal amount of time for HttpClient to send/receive a GetAsync Message? Is there a faster way to do this?

static readonly HttpClient client = new HttpClient();
        public MainWindow()
        {
            InitializeComponent();
        }

        private async void Register_ClickAsync(object sender, RoutedEventArgs e)
        {

            int counter = 0;
            string line;

            System.IO.StreamReader file = new System.IO.StreamReader(@"C\path.txt");

            while ((line = file.ReadLine()) != null)
            {
                try
                {
                    var watch = Stopwatch.StartNew();
                    HttpResponseMessage response = await client.GetAsync(line);
                    response.EnsureSuccessStatusCode();
                    string responseBody = await response.Content.ReadAsStringAsync();

                    watch.Stop();
                    var elapsedMS = watch.ElapsedMilliseconds;
                    RequestTextBox.Text += "\n" + elapsedMS;

                }
                catch (HttpRequestException ex)
                {
                    Console.WriteLine("\nException Caught!");
                    Console.WriteLine("Message :{0} ", ex.Message);
                    this.RequestTextBox.Text += ("\n" + "Message: {0} ", ex.Message);
                }
            }
            file.Close();  
        }
    }

UPDATE: This original program is a .net Core WPF app. I created a .net framework WPF app with the exact same code. The .net framework app takes 2000 ms to send the first HttpClient GetAsync command, and then <10 ms for subsequent commands. This is a massive performance increase. Does anyone have an explanation? I have been unable to find any articles explaining this.

Answer 1

Your code is awaiting for each request.

You can create many tasks by calling GetAsync and then wait them all with Task.WhenAll(). It will be more faster.