3 ms·SBCL. It's one of the only open source good ones I've found.by smanek 17y agoSBCL. It's one of the only open source good ones I've found.aerique 17y agoHave you looked around good enough? :-) Clozure CL and CLISP are pretty solid as well, although the latter might have performance issues.smanek 17y agoI've been hearing good things about Clozure lately, but never played with it. CLISP was just too slow for my taste though ...