optimized demo start-up speed

src/Shared/HandyControlDemo_Shared/App.xaml.cs

@@ -73,6 +73,7 @@ namespace HandyControlDemo
                     UpdateSkin(GlobalData.Config.Skin);
                 }
 
+                ConfigHelper.Instance.SystemVersionInfo = CommonHelper.GetSystemVersionInfo();
                 ConfigHelper.Instance.SetWindowDefaultStyle();
                 ConfigHelper.Instance.SetNavigationWindowDefaultStyle();