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    <p>Consider the differences in the languages and the overhead this occurs -- even if such additional work is done "at the same efficiency" there is just more to do. Period. (This is the price that often comes with abstraction: development time can be [substantially] decreased for [moderate] increases in run-time.)</p> <p>On the other hand, with a trivial function using no "language features" such as a loop computing a factorial ... then the numbers <em>can become very competitive</em> in certain cases. This can be seen in <a href="http://benchmarksgame.alioth.debian.org/" rel="nofollow noreferrer">The Computer Language Benchmark Game</a> (here is <a href="http://benchmarksgame.alioth.debian.org/u32/compare.php?lang=java&amp;lang2=gpp" rel="nofollow noreferrer">Java7 vs. C++</a>, for instance).</p> <p>Note that the <em>implementation</em> of a language (including JIT) and the optimizations ("-Ox") applied is also a major factor. (A language arguably "has no speed" in and of itself.)</p> <p>Happy coding.</p> <hr> <p>As Been Voigt pointed out, the JIT/AOT models are optimized for different aspects. (The <del>Sun</del> Oracle Java implementation even has a separate server VM and client VM which each prioritize difference use-cases.) Here are some SO posts discussing JIT vs. AOT:</p> <ul> <li><a href="https://stackoverflow.com/questions/7591169/why-is-it-hard-to-beat-aot-compiler-with-a-jit-compiler-in-terms-of-app-perform">Why is it hard to beat AOT compiler with a JIT compiler (in terms of app. performance)?</a></li> <li><a href="https://stackoverflow.com/questions/538056/jit-compiler-vs-offline-compilers">JIT compiler vs offline compilers</a></li> <li><a href="https://stackoverflow.com/questions/5525082/jit-vs-ngen-what-is-the-differene">JIT vs NGen - what is the difference?</a> [.NET, NGen is AOT]</li> </ul>
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    1. POWhy do compiled languages not perform equally if they eventually become machine code?
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    1. COAlso, the optimization effort (and time) of a good C++ compiler isn't suitable for JIT compilation, you could be adding minutes to the startup time if a JIT used all those optimization techniques.
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