After having done this mission like ... over 30 times ... I've come to hate it tremendously. It's fast, intense, fun in its own way, but man, random factors can easily account for 30s to 1 minute of time. The specific aggro controls that I prepared are inherently random; if monsters aggro in a specific way they die considerably faster, but if they don't you can easily lose 20-30s. I've had several runs where one specific aggro control resulted in a really fast clear, yet also had that same aggro control result in a wipe. Naku is very guilty of getting stuck too. Sometimes he doesn't get stuck at all, but other times he just stops running at random, losing a few more precious seconds.
That said, from my endless runs through this mission I've learned a lot about Guild Wars. Some of this knowledge can undoubtedly be exploited elsewhere. Thanks for hosting!