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The new webkit view (WKWebView) is JITed. I'm not sure about using JavaScriptCore independently of it though.

JavaScriptCore isn't JITed, even on iOS 8.

Pretty sure I heard them say exactly that it was at WWDC. I wrote it down in my notes anyway. ~04:30 in the WWDC video "Introducing the Modern WebKIT API"

It was stated it used 4th tier LLVM JIT (FTL) [0]. Do you have evidence to the contrary? What did you do to test? If you can outline what you did I will be happy to help out and investigate.

[0]: https://www.webkit.org/blog/3362/introducing-the-webkit-ftl-...

Sorry, you probably misunderstood me – WKWebView runs in a separate process and does have a JIT (discussed in that video); JavaScriptCore runs in the same process and does not.

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