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Re:Firefox Focus – a free, fast and easy to use private brow... by zapu on Thursday November 17, 2016 @01:05PM (#12979787)
Is either able to use JIT for JavaScript engine or is it only enabled for Apple's "blessed-process" iOS Safari?
Re:Firefox Focus – a free, fast and easy to use private brow... by st3fan on Thursday November 17, 2016 @02:17PM (#12980497)
Only the WKWebView gets fast JavaScript. Any app that uses it will inherit that functionality.

For example, Firefox for iOS ranks exactly the same as Safari in speed benchmarks.

Re:Firefox Focus – a free, fast and easy to use private brow... by eridius on Thursday November 17, 2016 @06:02PM (#12982588)
WKWebView executes out-of-process just like Safari and so it performs just as well. In fact, that's the whole reason that WKWebView exists (instead of just using UIWebView).