SJT> We want an engine that will be usable on all platforms we SJT> support, an efficiency improvement on most of them, and a big SJT> efficiency improvement on as many as possible. Holger> How many of the Scheme implementations mentioned does are Holger> ruled out by this commitment (to which I totally agree) ? MS> None. The efficiency varies greatly among them, but all are MS> vastly faster than Elisp. I wasn't so concerned with the efficiency as with the availabilty on a large number of platforms. Do you want to port a "foreign" scheme system to a new machine type ? I certainly won't want to. Holger -- --- http://www.coling.uni-freiburg.de/~schauer --- "Wie haben andere Linux Benutzer ihr `erstes Mal' mit Linux erlebt??" "Wir haben danach gemeinsam eine Gitanes geraucht und nochmal ueber alles geredet." -- P.Vollmann und Stefanie Teufel in de.comp.os.linux.misc