When testing, start the core and then delay 1s before starting the test

https://github.com/2dust/v2rayN/issues/7391

v2rayN/ServiceLib/Services/SpeedtestService.cs

@@ -196,6 +196,7 @@ public class SpeedtestService
             {
                 return false;
             }
+            await Task.Delay(1000);
 
             var downloadHandle = new DownloadService();
 
@@ -255,9 +256,13 @@ public class SpeedtestService
                 try
                 {
                     pid = await CoreHandler.Instance.LoadCoreConfigSpeedtest(it);
-                    if (pid > 0)
+                    if (pid < 0)
                     {
-                        await Task.Delay(500);
+                        UpdateFunc(it.IndexId, "", ResUI.FailedToRunCore);
+                    }
+                    else
+                    {
+                        await Task.Delay(1000);
                         var delay = await DoRealPing(downloadHandle, it);
                         if (blSpeedTest)
                         {
@@ -271,10 +276,6 @@ public class SpeedtestService
                             }
                         }
                     }
-                    else
-                    {
-                        UpdateFunc(it.IndexId, "", ResUI.FailedToRunCore);
-                    }
                 }
                 catch (Exception ex)
                 {

v2rayN/ServiceLib/ViewModels/MainWindowViewModel.cs

@@ -552,6 +552,7 @@ public class MainWindowViewModel : MyReactiveObject
         {
             await LoadCore();
             await SysProxyHandler.UpdateSysProxy(_config, false);
+            await Task.Delay(1000);
         });
         Locator.Current.GetService<StatusBarViewModel>()?.TestServerAvailability();