gistfile1.cs

                        var watch = Stopwatch.StartNew();
                        customer.Routes.Add(route);
                        watch.Stop();
                        var routesAddMs = watch.ElapsedMilliseconds;
                        watch.Start();
                        context.Customers.Add(customer);
                        watch.Stop();
                        var customersAddMs = watch.ElapsedMilliseconds;
                        if (row % 500 == 0)
                        {
                            txtLog.AppendText(Environment.NewLine + "строк " + row .ToString()+ ", Routes.Add - " + routesAddMs.ToString() + " Customers.Add " + customersAddMs.ToString());
                            System.Threading.Thread.Sleep(1000);
                        }