If you are going to use advance search make sure you are looking for somthing specific. the google seach tool is more for general search stuff, new people and the public.
Its partly there to help google index the site better but as well when a new person joins and searches UFC, Dana White, MMA, Gracie. very general very broad terms that will show up in probably half of the 63,500+ threads it can cuase the search to hang on a query (take too f*ng long) and just crash or lock up the search tool for everyone else.
Similiar things will happen when you decide to show posts by user and the user is active and has over 10,000 posts.
This is why seach and new posts usually gets turned off durring a main PPV event, to keep the traffic that is drawn to here before and after a major PPV flowing.