We had a lot of problems in the beginnign with .Threads but we are running great now. The site is as fast as our peers, and we have Astaran to thank for helping us modify a lot of the features that were slowing the site down.
We have disabled search entirely but hope to have it back up in some fashion. Now before anyone disses us about this keep in mind that we have gotten 13,000 members in two years. We get 1500 - 2000 new posts every 24 hours.
Only other thing that is a pain are the moderator buttons we'd like to have them more accessible.