Try to fix

https://github.com/2dust/v2rayN/issues/7128

v2rayN/ServiceLib/ViewModels/MainWindowViewModel.cs

@@ -548,8 +548,11 @@ public class MainWindowViewModel : MyReactiveObject
 
         BlReloadEnabled = false;
 
+        await Task.Run(async () =>
+        {
             await LoadCore();
             await SysProxyHandler.UpdateSysProxy(_config, false);
+        });
         Locator.Current.GetService<StatusBarViewModel>()?.TestServerAvailability();
 
         _updateView?.Invoke(EViewAction.DispatcherReload, null);

v2rayN/ServiceLib/ViewModels/StatusBarViewModel.cs

@@ -318,7 +318,10 @@ public class StatusBarViewModel : MyReactiveObject
 
         _updateView?.Invoke(EViewAction.DispatcherServerAvailability, ResUI.Speedtesting);
 
-        var msg = await (new UpdateService()).RunAvailabilityCheck();
+        var msg = await Task.Run(async () =>
+        {
+            return await (new UpdateService()).RunAvailabilityCheck();
+        });
 
         NoticeHandler.Instance.SendMessageEx(msg);
         _updateView?.Invoke(EViewAction.DispatcherServerAvailability, msg);