Bigger is better?

SELECT * FROM gallery2 WHERE topic_id="1541881" UNION SELECT * FROM gallery2 WHERE topic_id="700453" UNION SELECT * FROM gallery2 WHERE topic_id="1097473" UNION SELECT * FROM gallery2 WHERE topic_id="599226" UNION SELECT * FROM gallery2 WHERE topic_id="780357" UNION SELECT * FROM gallery2 WHERE topic_id="1537051" UNION SELECT * FROM gallery2 WHERE topic_id="224143" UNION SELECT * FROM gallery2 WHERE topic_id="1271517" UNION SELECT * FROM gallery2 WHERE topic_id="1290642" UNION SELECT * FROM gallery2 WHERE topic_id="1599603" UNION SELECT * FROM gallery2 WHERE topic_id="604764" UNION SELECT * FROM gallery2 WHERE topic_id="149657" UNION SELECT * FROM gallery2 WHERE topic_id="92700" UNION SELECT * FROM gallery2 WHERE topic_id="1280629" UNION SELECT * FROM gallery2 WHERE topic_id="52325" UNION SELECT * FROM gallery2 WHERE topic_id="1022021"