在mvc 4中只加载一次布局页面

hi i have mvc website where i am using layout for consistant look and feel. now my menu is dynamically generated based on user role,level etc. i have put menu on layout page.when user logs in menu generated as per its role from database .when user clicks on menu it loads the currosponding view in layout, but it also refresh the layout page becouse all views have layout , so menu also gets regenerated cousing databse trip. how should i avoid menu reloading ? i dont want to use ajax to load views in layout page becouse back button doesent work and new tab loads pages without layout. please helphi i have mvc website where i am using layout f