At risk of putting my foot in my mouth... If DragonFly BSD isn't there yet in terms of performance, on Rahul's hardware in the area of scientific computation, it might be better to simply admitt that this -could- be the case, thank him for his interest, ask him to be patient, and then try to estimate the time to when DragonFly BSD will be equal or superior to his other platform choices.
I believe Rahul said that he has been using DragonFly BSD for 2 years, and while it would be possible to fail to make a thorough evaluation during 2 years, I would think he has tried to use DragonFly BSD for his purposes and is basing his performance estimates on that experience. It's not a good idea to alienate potential users by being agressively apologetic. But I'm just a lurker. I just found this thread a lot less fun. /Jonas Sundström.