Try this simple code
function clean_admin_dashboard() {
if ( !is_super_admin() ) :
remove_menu_page( 'w3tc_dashboard' );
endif;
}
add_action( 'admin_init', 'clean_admin_dashboard');
function remove_admin_bar_links() {
if ( !is_super_admin() ) :
global $wp_admin_bar;
$wp_admin_bar->remove_menu('w3tc');
endif;
}
add_action( 'wp_before_admin_bar_render', 'remove_admin_bar_links' );
