There are two things to try on the kit: Turn on the INSTRUMENT flag and see how many dispatches are happening per second. (You just take the C code and add the line #define INSTRUMENT TRUE as the very first line (before any includes.) Second, we could try it on vc1, Siskind's machine with 2 gig of RAM. With the new stack compressing, it might be able to compile it without the flags to decrease polyvariance and inlining.