&gt; Additionally only Apple&#x27;s JavaScript engine is allowed to use a JIT compiler.<p>I&#x27;m not intimately familiar with the iOS API, but I believe that this is no longer the case, courtesy of WKWebView[0], which was released in iOS 8.<p>0: <a href="https:&#x2F;&#x2F;developer.apple.com&#x2F;library&#x2F;ios&#x2F;documentation&#x2F;WebKit&#x2F;Reference&#x2F;WKWebView_Ref&#x2F;" rel="nofollow">https:&#x2F;&#x2F;developer.apple.com&#x2F;library&#x2F;ios&#x2F;documentation&#x2F;WebKit...</a>