ios - Very poor performance after dismissViewController -

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i have view controller presents 1 modally contains gif , table view animation on cells, , when dismiss it, app has annoyingly long delay before can again (like 3-5 seconds).

i've found answers it's because still have reference vc after dismissal, don't see how that's possible because place make reference in prepareforsegue.

any suggestions?

edit 1:

here prepareforsegue:

override func prepareforsegue(segue: uistoryboardsegue, sender: anyobject?) {     let destvc = segue.destinationviewcontroller as! inworkoutviewcontroller     destvc.workout = workout }

the destvc's workout property optional custom class.

edit 2:

here how vc dismissed (still slow):

@ibaction func tappedx(sender: anyobject) {     dispatch_async(dispatch_get_main_queue(), { [unowned self] in         self.dismissviewcontrolleranimated(true, completion: nil)     }) }


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