pushviewcontroller animation is slow/choppy

Question

I push a ViewController which contains not too many views, UIScrollView which contains 10 views inside, I have a singleton ViewController

Answer 1

My problem is I puts mass load codes in viewWillAppear. My case is

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)

    tableView.reloadData()
}

And I have a lot of rows, so pushViewController is laggy.