Showing hidden view really slow

Question

I have a setup as such:

self.webView = WKWebView(frame: frame, configuration: WKWebViewConfiguration())
self.externView = UIView(frame: frame)
self.externWeb         


        

Answer 1

Swift 3:

DispatchQueue.global(qos: .background).async {
   DispatchQueue.main.async {
   // enter code here
   }
}