Possibly. Our thoughts were to create a few up front, then take a look at the traffic/content after a few months to see if we were getting good distribution, readers were posting in the correct forum, etc. From what I've seen so far we cover perf tuning in just about all of them. Not sure if that is a case for or against a new category!
We'll put this on our list of things to think about - we'll let you know what we decide.
Thanks for the suggestion!