切换视图时，UITableView变慢

我正在开发一个应用程序，它有一个主菜单，然后根据使用UINavigationController单击的菜单项切换视图。每当我运行我的应用程序并单击菜单中的某个项目时，在加载视图之前，这是一个很好的五秒钟。这是正常的还是我需要用另一种方式。谢谢你的关注

我在RootViewController.m中的代码如下所示

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSString *selectedMenuOption = [menuOptions objectAtIndex:indexPath.row];
if (selectedMenuOption == @"Trails") {
    TrailsViewController *trailsViewController = [[TrailsViewController alloc] initWithNibName:@"TrailsViewController" bundle:[NSBundle mainBundle]];
    trailsViewController.selectedMenuOption = selectedMenuOption;
    [self.navigationController pushViewController:trailsViewController animated:YES];
    [trailsViewController release];
}
if (selectedMenuOption == @"Bike Shops") {
    ShopsViewController *shopsViewController = [[ShopsViewController alloc] initWithNibName:@"ShopsViewController" bundle:[NSBundle mainBundle]];
    shopsViewController.selectedMenuOption = selectedMenuOption;
    [self.navigationController pushViewController:shopsViewController animated:YES];
    [shopsViewController release];
}}

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我把它整理好了。我忘了在下一个视图中设置行数等