As the Ionic Team said: Speed is a requirement, not a feature.
In this tuts we implement the solutions to make our mobile applications faster by exploring two ways: the WKWebView API and the Ionic 3 VirtualScroll.
https://www.javascripttuts.com/ionic-3-performance-boost-with-observable-using-virtualscroll-and-wkwebview/
Ahem: Link is missing 
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Ahah indeed.
Thanks!