<A target="_blank" href="http://www.juliusbuss.de/web/youatnotes/blog-jb.nsf/dx/optimized-an-agents-runtime-from-30-minutes-to-less-than-30-seconds.htm">Julian Buss has an agent that needs to be run several times a day</A> and, at 30 minutes each run, it was causing problems. He started by cleaning up the code, and is now down to a more reasonable runtime.