SimpleMachines / SMF2.1

			$query_this_board = 'b.id_board IN (' . implode(', ', $boards) . ')';

		// Try to limit the number of messages we look through.

		if ($total_cat_posts > 100 && $total_cat_posts > $modSettings['totalMessages'] / 15)

			$context['optimize_msg']['lowest'] = 'm.id_msg >= ' . max(0, $modSettings['maxMsgID'] - 400 - $_GET['limit'] * 5);

	}

	elseif (!empty($_REQUEST['boards']))

	{

			$query_this_board = 'b.id_board IN (' . implode(', ', $boards) . ')';

		// The more boards, the more we're going to look through...

		if ($total_posts > 100 && $total_posts > $modSettings['totalMessages'] / 12)

			$context['optimize_msg']['lowest'] = 'm.id_msg >= ' . max(0, $modSettings['maxMsgID'] - 500 - $_GET['limit'] * 5);

	}

	elseif (!empty($board))

	{

		$query_this_board = 'b.id_board = ' . $board;

		// Try to look through just a few messages, if at all possible.

		if ($total_posts > 80 && $total_posts > $modSettings['totalMessages'] / 10)

			$context['optimize_msg']['lowest'] = 'm.id_msg >= ' . max(0, $modSettings['maxMsgID'] - 600 - $_GET['limit'] * 5);

	}

	else

	{