I modified the EBMT system so that when in debug mode it doesn't hang around waiting for diagrams to be created. Before the change, CPU utilisation was down around 40% for the java process, because it would wait for deps2dot.pl and dot to run before resuming. I've changed it so that diagrams are created in their own thread, which are spawned and then forgotten about. Now the java process is consistently running at 100%, with about six or seven other threads creating images simultaneously, using up roughly another 100% CPU.