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

Run the hide/show code on the UI thread

 dispatch_async(dispatch_get_main_queue()) {
        WKExteralLoader.webView!.hidden = false;
        WKExteralLoader.externView!.hidden = true;
    }