[@nightgunner5 Member 16 years, 3 months ago]

Try installing this plugin: https://bbpress.org/plugins/topic/bb-benchmark/

And adding the following line to your bb-config.php:

define('SAVEQUERIES', true);

Then, you can view source on any forum page (when logged in as admin) and it will tell you the slowest query, along with the function that used it. It’s usually simple guessing to figure out which plugin a query came from after that.