Another tests of my heavy project.
iPad3 ios9:
WKWebView, no WKWebView - terrible overall performance
preview via Wi-Fi - low performance
iPhone6 ios9:
WKWebView, no WKWebView - very slow loading of files, admissible performance of rest things
preview via Wi-Fi - admissible performance
Sony Z1 Compact
WebView - good performance
preview via Wi-Fi - very good performance
In general, performance in IOS (after the export ) is disgusting.
I would like to see the official comment about what is happening and is there hope.