The heading says it all! Having had many questions on this article over the year, I decided to take another look at the topic. The article was based on the work of dozencrows, and since last Easter, he has been working on updating the original setup. The update points you to his later version of motion and an associated config file, which together give a vastly improved performance. I take no credit for this. I merely act as a conduit to point you to a great piece of work.
Click here for the update.