If learning native isn't/wasn't your thing, I would have suggested Appcelerator Titanium. I was in the same boat as you. But thanks to Titanium's failings, I e

If learning native isn't/wasn't your thing, I would have suggested Appcelerator Titanium. I was in the same boat as you. But thanks to Titanium's failings, I eventually learned how to make iOS and Android 'modules' which could do anything the native Java or Objective-C couldn't do for the apps I was building. I wasn't dealing with fps WebView performance at the time, but I was scratching an itch. But I have been up against that before and have dealt with it with WKWebView too. It is faster, for sure. I feel Swift and Java are closer these days. So I hope to soon ditch these hybrid frameworks and do everything native. (Though I will say that after 12 months working with AngularJS for the web, I've recently discovered Ionic, and will be using that for a big job coming up).