Chez is AOT compiled down to the metal; it's not an interpreted VM or a JIT compiler. My initial reaction was "Oh good. This means Racket will run much faster!"

Chez is AOT compiled down to the metal; it's not an interpreted VM or a JIT compiler. My initial reaction was "Oh good. This means Racket will run much faster!" But that's not really true. Some things are faster; some aren't. The real reason is that because Chez compiles to the metal, it makes maintainability easier because less C code is needed.