Jonl, In a recent message you remarked: Since you chose to compare KCL with Lucid Common Lisp, then I presume that you have made a tacit assumption that of the "other Lisps around", Lucid is the fastest? Hypotheses non fungo. I point you to a recent Lucid advertisement (Lucid Moments, Spring 88, Volume 2, Number 2) which uses the phrase "Lucid Common Lisp, the recognzied Common Lisp Standard"!