TableView DidSelectRowAt() latency - uitableview

Question

Hello I actually use a tableview in my app. I have this lines of code which switch from a VC to a mother and it work fine everywhere :
let vue = MAINSTORYBOARD.instantiateViewController(withIdentifier: "accueil") as! Accueil
self.present(vue, animated: true, completion: nil)
In my tableView I use the function DidSelectRowAt ( this execute when I click on a row/cell) to do this (switch of VC)
But you've already understood when I click it work but with latency.
This latency can is sometimes 1-2s sometimes up to 12s it's random. That's weird.
I specify the function above work instantly with buttons and others.
this is the code (I write only important things) :
class Horaire: ViewController, UITableViewDataSource, UITableViewDelegate {
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let vue = MAINSTORYBOARD.instantiateViewController(withIdentifier: "accueil") as! Accueil
self.present(vue, animated: true, completion: nil)
}
and the other class :
class Accueil: ViewController {
override func viewDidLoad() {
super.viewDidLoad()
print("viewDidLoad executed")
}
}
So when I click on a cell of my tableview it immediately print "viewDidLoad executed" but VC switch is done only after some random seconds.
Why does I have this latency and how to fix it ? it don't use segue

Answer 1

The first thing that came to my mind was to put the block in the main queue. I know didSelectRowAt is supposed to run in the UI thread, but I saw on the internet a couple complaints about this very same thing. Looks like a bug to me.
class Horaire: ViewController, UITableViewDataSource, UITableViewDelegate {
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
DispatchQueue.main.async{
let vue = MAINSTORYBOARD.instantiateViewController(withIdentifier: "accueil") as! Accueil
self.present(vue, animated: true, completion: nil)
}
}
}
You can see for some odd reason this seemed to work for these people:
https://github.com/HeroTransitions/Hero/issues/79