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Is either able to use JIT for JavaScript engine or is it only enabled for Apple's "blessed-process" iOS Safari?



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.


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).




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