Ok, then it's aparently the intermediate representation (what the parser feeds to the evaluator), which makes sense. The evaluator doesn't care, whether it come

Ok, then it's aparently the intermediate representation (what the parser feeds to the evaluator), which makes sense. The evaluator doesn't care, whether it comes from the parser or from constructs-to-c generated code. Concerning the use case, an SBCL based solution would likely perform much better, though the Scheme VM of Common Music (https://ccrma.stanford.edu/software/snd/snd/s7.html https://ccrma.stanford.edu/software/snd/snd/s7.html) is also purely interpreted.