I tried to upgrade from v11.2 to v12.1 and realize that when I select a tab on a ribbon that contains several tools it takes more time to show the content of the tab.
In wpf I used to have the following:
<r:MenuTool Caption="Book List" ItemContainerStyle="{StaticResource BookMenuItemStyle}" ItemsSource="{Binding Source={StaticResource BooksList}}" ItemTemplate="{StaticResource BooksTemplate…