Modal View Controller presentation delay

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    
    TestViewController *viewController = [[TestViewController alloc] init];
    [self presentViewController:viewController animated:YES completion:nil];
}

It looks like this code produce random lag (0.05s - 0.5s) when presenting any UIViewController. (tested on iOS7.1, device and simulator). Using the same presentation code outside of tableView:didSelectRowAtIndexPath: method doesn't cause any lag.