[kh99]

Maybe try replacing the sql with:

			$sql = "
				SELECT contenttypeid, tagcontent.contentid, tagcontent.contentid as threadid, thread.lastpost AS lastpost
				FROM ". TABLE_PREFIX . "tagcontent as tagcontent
				LEFT JOIN ". TABLE_PREFIX . "thread as thread ON (thread.threadid = tagcontent.contentid)
				WHERE tagid = " . $equals['tag'] . " 
				ORDER BY lastpost DESC 
				LIMIT 20000";