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(tak ...) benchmark

I just ran the following code in t2.8,

	(define (tak x y z)
	      (((tak1 x y z)
		   (if (not (< y x) z
			   (tak1 (tak1 (fx- x 1) y z)
			         (tak1 (fx- y 1) z x)
				 (tak1 (fx- z 1) x y)))))))
	      (tak1 x y z)))

and got the following results for

	(tak 18 12 6)

  Dn300		16.5 seconds
  Dn460		 8.8 seconds

Can anyone explain why these results are so much worse that the
ones published on AI-List.

	-Charlie Dolan