Test in Xcode 12.0 beta 3 and simulator.
When call load/loadHTMLString/loadFileURL methods to load webpage or html string, there is an obvious delay(20~30 seconds) before loading actually starts.
Another thing is:
If restart simulator, first-time WKWebView loading speed is normal, but if terminate app and re-launch, WKWebView becomes slow for loading content, and in Xcode console, log as below will be shown:
[Process] 0x7fa53e81d020 - [pageProxyID=6, webPageID=7, PID=3679] WebPageProxy::processDidBecomeUnresponsive:
Anybody knows how this happened.