When designing new language, one usually starts with an AST interpreter. When the language is ready for use, users find out it is great, but slow. So one starts to design a bytecode to speed things up. That may help a bit, but usually the result is clear: still the execution is slow. Truffle project offers you a different perspective: write your AST interpreter using Truffle nodes API and we make it fast! In addition to that we also give you tooling for free! As a proof we'll demonstrate that our implementation of Ruby is ten times faster than any other one, including indy based JRuby. Stop by for a short introduction how to be create the fastest execution environment for any language!