Mandelbort benchmark: Emacs (native-comp) runs 10x slower than Java or Truffle implementation 1 So I've been working on an interpreter for Emacs Lisp using the GraalVM Truffle framework for a while now. As I've just completed its AST interpreter and a bytecode interpreter, I guess its time to give it a little write-up (or rather, some random babbling of various tricks). Although the Truffle interpreter covered here is for Emacs Lisp only, most of the following should also be applicable to other Lisp dialects and maybe other Truffle-based language implementations.