Slides: <a href="http:&#x2F;&#x2F;socalpls.org&#x2F;2013nov&#x2F;slides&#x2F;zippy.pdf" rel="nofollow">http:&#x2F;&#x2F;socalpls.org&#x2F;2013nov&#x2F;slides&#x2F;zippy.pdf</a><p>It is probably the fastest Python implementation (on or off the JVM). It beats PyPy by a large margin on most benchmarks:<p><a href="http:&#x2F;&#x2F;thezhangwei.com&#x2F;documents&#x2F;oopsla113-zhang.pdf" rel="nofollow">http:&#x2F;&#x2F;thezhangwei.com&#x2F;documents&#x2F;oopsla113-zhang.pdf</a>