lol Glad to see your elite searching skillzz. I do not think its necessary yet, but it might be something to look into in the near future.

We kinda implemented it late, at like 2.3 million posts the forum was crashing every 30mins that search had to disabled for a while.

After Sphinx search was added and optimizations (Removed Apache, added custom Nginx and PHP RPM's). The 1000 user parallel 10 second stress test gave us a whopping 320% overall increase in performance (63 fetches/s @1.56mbps). So unless 1000 users can each open more than 63 forum pages per second then the server will cope fine. Also search has been a breeze.