ASP.NET

I have created housie game page, but it is loading slow. Can some one suggest is it coding issue or network issue.
If i run code locally on my pc, it runs fast, but once uploaded on site winmilestone com, it becomes slow.
page winmilestone com / housie
Host server is in usa location, does the site becomes slow if accessed from different countries.
for example, if I click/mark number in housie game, it takes time to refresh but when i test it in my local server, housie game is fast.
how can i test my website speed access across different countries, to check if site is fast in usa and slow in other countries.

Sub Salesorder()

        Dim found As Boolean = False

        cn.Open()
        cm = New SqlCommand("select * from tblbill where SalesOrderNo like '" & txtInvoiceFor.Text & "'", cn)
        dr = cm.ExecuteReader
        dr.Read()
        If dr.HasRows Then found = True Else found = False
        dr.Close()
        cn.Close()

        If found = True Then
            cn.Open()
            cm = New SqlCommand("update tblbill set INno = @INno where SalesOrderNo=@SalesOrderNo", cn)
            With cm.Parameters
                .AddWithValue("@INno", txtInvoiceNo.Text)
                .AddWithValue("@SalesOrderNo", txtInvoiceFor.Text)
            End With
            cm.ExecuteNonQuery()
            cn.Close()

        End If

    End Sub

public string ReadConfig(string ValueToGet)
{
    System.Configuration.AppSettingsSection section = (System.Configuration.AppSettingsSection)config.GetSection("appSettings");
    return section.Settings[ValueToGet].Value;
}

// get the report URL
string URL = Master.ReadConfig("DailyReport");

IPAddress hostIPAddress = IPAddress.Parse(Request.UserHostName);
IPHostEntry hostInfo = Dns.GetHostEntry(hostIPAddress);
string[] tempSystemName = hostInfo.HostName.Split('.');

WebLibrary.loadUserInformation(Request.LogonUserIdentity.Name, Request.UserHostAddress, tempSystemName[0]);
currentUser.Text = "Current User: " + WebLibrary.visitorFullName + "<br />Access: " + userType + "";

@{
              foreach (var item in (List<TarefasModel>)ViewBag.MostrarTarefas)
              {
                      <tr>
                          <td><button type="button" class="btn btn-warning" data-toggle="modal" data-target="'#Modalpopup + @item.Id'">Editar</button></td>
                          <td>@item.Id</td>
                          <td>@item.NomeTarefa</td>
                          <td>@item.Descricao</td>
                          <td>@item.Atribuido</td>
                          <td>@item.DataVencimento</td>
                          <td><button type="button" class="btn btn-success" onclick="Excluir(@item.Id)">Concluido</button></td>
                      </tr>

              }
          }

      </tbody>

<td><button type="button" class="btn btn-warning" data-toggle="modal" data-target="'#Modalpopup + @item.Id'">Editar</button></td>