Note that the C++ is half the code and 6 times as fast. This supports my general impression that you can torture decent performance out of a Lisp compiler, but the result will be ugly, and you'll rarely match C.

I see the ratio as 28.39 sbcl to 10.61 for g++, closer to 3 on the 64 bit version.

At any rate, I was addressing generating and then running Asm from Lisp issue.