As a guile user myself, I feel I must say that guile works just fine also when you are not embedding it. It is a very capable scheme, and even though it is not

As a guile user myself, I feel I must say that guile works just fine also when you are not embedding it. It is a very capable scheme, and even though it is not as fast as chez or racket, things have gotten a lot better (the upcoming JIT in the 3.0 release means at least a 2x speedup).