ios - iAd is killing the performance of my app -

I have developed an app for iOS with swift and now I want to add one To show some iAd banner in ADBannerView my tableviewcontroller . I did this:

1. I linked to the iAd framework

2. ViewDidLoad in my tableviewcontroller The following code has been added:

   self.canDisplayBannerAds = true

Very easy! Probably very easy, because everything seemed to work well, this scene showed the advertisement correctly but ... the performance was really bad !! My tableview scroll is smooth if I do not show ads and ads are cold during the display ... how come? What am I missing?

Thanks a lot

D. Thank you for your help, I was totally wrong, because of the slow speed of my app, IAD.