app hangs for some time when navigate in different screens - ios

i am working on an app which contains 21 screens at all, when i navigate to other screens, back buttons or other buttons stucks for a little time.
i am using swreavelViewController, if go to other screen via segue, and if click back button it stucks app for a moment.. i have uibuttons and or other items, it stucks the app.
i am not using navigation controller, i go to other screens via segues,

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I am trying to create an ios app that consists of a tab bar controller with three buttons for 3 different pages. However, when I run the program the first few seconds shows it correctly but then it changes to a simple tab bar controller.
on left is my tab bar controller and on the right is shown by the simulator
You've edited the wrong storyboard. You have edited the Launch Screen storyboard. So during launch it shows your 3-tab interface. But then the app starts running and the Main storyboard is used. You didn't edit that one, so we are back to the plain vanilla Tabbed App template.
What you should have done was to edit the Main storyboard.

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I have a slide out menu in my application and when I quickly tap on menu items, the navigation bar get corrupted. That is the back button in one of the screen is getting overlapped with Hamburger menu button. When tapping the overlapped combination application get crashed. I tried with making animation 'false' in the self.navigationController?.pushViewController(myViewController, animated: false), but the issue still exist.
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I just added a screen shot of the problem below.

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I'm making an iOS app using Bluetooth. The app is supposed to show a list of Bluetooth device when the button "Bluetooth" is clicked. The list is a tableView shown as a popOver view controller.
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Screen shot of my storyboard

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