Full white screen appears for few seconds before pushing the view controller

I'm getting white screen before pushing the view controller for few seconds then the UIViewController loads.

I didn't kept any break points and there is target membership. I attached the screen shots of push animation. For some push am getting it. please suggest how to proceed.

let storyboard = UIStoryboard(name: "Chat", bundle: nil) 
let conversationViewCntrl = storyboard.instantiateViewController(withIdentifier: "ConversationViewControllerId") as! ConversationViewController 
navigationController?.pushViewController(conversationViewCnt‌​rl, animated: true)

Copyright Notice：Content Author:「SriMa」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/41734613/full-white-screen-appears-for-few-seconds-before-pushing-the-view-controller