&gt;That&#x27;s the point to PyPy. You get fast speed of development and fast CPU performance. Best of every world. That&#x27;s why we use it and not CPython. It&#x27;s already bigger than you think.<p>What you use it for, where you need the speed and don&#x27;t have a C based module to rely on? I don&#x27;t mind having a bit more speed for &#x27;free&#x27;, but every time I tried, pypy hasn&#x27;t been hassle free due to some module compatibility, and yet pure python code has <i>never</i> been a bottle neck. I have been using Python for +10 years.<p>Anyway, the above question is for curiosity sake, it doesn&#x27;t change the point that CPython is where new language features are added. If Guido adopts pypy tomorrow, I would be happy, but otherwise, it will always try to catch up, so I don&#x27;t see how it can be the future.