Another, probably more detailed article on optimizing Common Lisp code in SBCL:<p><a href="http://t-b-o-g.blogspot.com/2009/12/brians-brain-on-common-lisp-take-3.html" rel="nofollow">http://t-b-o-g.blogspot.com/2009/12/brians-brain-on-common-l...</a><p>It highlights the importance of profiling code first.