Nobody? I'm sure you researched that statement along with spending some time actually doing that before you said it right? In most versions of Common Lisp you

Nobody? I'm sure you researched that statement along with spending some time actually doing that before you said it right? In most versions of Common Lisp you can see the exactly assembler output of your function, allowing you to optimise your code at any level you want. Like other people mentioned, you can add type declarations to ensure that the correct machine types are used, and you even have goto. What specific aspects of Lisp are you saying prevents optimisation? Especially given that Lisp has more low-level control than most other languages.