There is 1 additional query on each page view of forumdisplay.php.
The query is identical to the query that pulls all the threads for the specific forum you are viewing.. basically vbulletin queries the database for all threads in forum X (the forum you're viewing) LIMIT by the number of threads per page. The after vBulletin pulls its threads, this mod goes ahead and pulls all threads from forum Y (the global forum) LIMIT the number you set in options.
The 1 query adds no noticeable performance loss IMO.
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