Optimization is always a good idea. For reference, my "conueries to date" (really for the last month) is 3.577 MCn; my "cycle estimate" is 4.472 MCn. (I run a fairly small MediaWiki-based site.) You might also want to check out your "ratio" in the detailed conuery report; that might be a better indicator of how efficient your script really is.
Very little to do with either emus or farmers!