Impressive gains

SELECT * FROM gallery2 WHERE topic_id="1746133" UNION SELECT * FROM gallery2 WHERE topic_id="1648433" UNION SELECT * FROM gallery2 WHERE topic_id="1337469" UNION SELECT * FROM gallery2 WHERE topic_id="1592926" UNION SELECT * FROM gallery2 WHERE topic_id="1668955" UNION SELECT * FROM gallery2 WHERE topic_id="825299" UNION SELECT * FROM gallery2 WHERE topic_id="1418155" UNION SELECT * FROM gallery2 WHERE topic_id="1411845" UNION SELECT * FROM gallery2 WHERE topic_id="1358131" UNION SELECT * FROM gallery2 WHERE topic_id="373216" UNION SELECT * FROM gallery2 WHERE topic_id="358346" UNION SELECT * FROM gallery2 WHERE topic_id="368671" UNION SELECT * FROM gallery2 WHERE topic_id="347297" UNION SELECT * FROM gallery2 WHERE topic_id="614040" UNION SELECT * FROM gallery2 WHERE topic_id="1157879" UNION SELECT * FROM gallery2 WHERE topic_id="1008121"