[@stevendaily Participant 12 years, 4 months ago]

I was able to get a custom taxonomy associated with topics only partially working with bbPress 2.6a and WP 3.8, but the performance of queries was terrible compared to using postmeta. A query using a custom taxonomy that took 3.8 seconds took only 0.01 seconds with the same information stored in postmeta. So performance needs to be taken into account.