Same SQL query running 40 times on forum display

2009-03-13 17:23:47 CET LOG:  durée : 53.388 ms, instruction : SELECT COUNT(n.nid) FROM (SELECT DISTINCT ON (nid) * FROM node) n INNER JOIN term_node tn ON n.vid = tn.vid AND tn.tid = 31 LEFT JOIN history h ON n.nid = h.nid AND h.uid = 1 WHERE n.status = 1 AND n.created > 1234369419 AND h.nid IS NULL
2009-03-13 17:23:47 CET LOG:  durée : 83.108 ms, instruction : SELECT COUNT(n.nid) FROM (SELECT DISTINCT ON (nid) * FROM node) n INNER JOIN term_node tn ON n.vid = tn.vid AND tn.tid = 50 LEFT JOIN history h ON n.nid = h.nid AND h.uid = 1 WHERE n.status = 1 AND n.created > 1234369419 AND h.nid IS NULL
2009-03-13 17:23:47 CET LOG:  durée : 52.884 ms, instruction : SELECT COUNT(n.nid) FROM (SELECT DISTINCT ON (nid) * FROM node) n INNER JOIN term_node tn ON n.vid = tn.vid AND tn.tid = 4 LEFT JOIN history h ON n.nid = h.nid AND h.uid = 1 WHERE n.status = 1 AND n.created > 1234369419 AND h.nid IS NULL
2009-03-13 17:23:47 CET LOG:  durée : 54.215 ms, instruction : SELECT COUNT(n.nid) FROM (SELECT DISTINCT ON (nid) * FROM node) n INNER JOIN term_node tn ON n.vid = tn.vid AND tn.tid = 28 LEFT JOIN history h ON n.nid = h.nid AND h.uid = 1 WHERE n.status = 1 AND n.created > 1234369419 AND h.nid IS NULL
2009-03-13 17:23:47 CET LOG:  durée : 54.393 ms, instruction : SELECT COUNT(n.nid) FROM (SELECT DISTINCT ON (nid) * FROM node) n INNER JOIN term_node tn ON n.vid = tn.vid AND tn.tid = 29 LEFT JOIN history h ON n.nid = h.nid AND h.uid = 1 WHERE n.status = 1 AND n.created > 1234369419 AND h.nid IS NULL
2009-03-13 17:23:47 CET LOG:  durée : 54.316 ms, instruction : SELECT COUNT(n.nid) FROM (SELECT DISTINCT ON (nid) * FROM node) n INNER JOIN term_node tn ON n.vid = tn.vid AND tn.tid = 26 LEFT JOIN history h ON n.nid = h.nid AND h.uid = 1 WHERE n.status = 1 AND n.created > 1234369419 AND h.nid IS NULL
2009-03-13 17:23:47 CET LOG:  durée : 59.272 ms, instruction : SELECT COUNT(n.nid) FROM (SELECT DISTINCT ON (nid) * FROM node) n INNER JOIN term_node tn ON n.vid = tn.vid AND tn.tid = 25 LEFT JOIN history h ON n.nid = h.nid AND h.uid = 1 WHERE n.status = 1 AND n.created > 1234369419 AND h.nid IS NULL
2009-03-13 17:23:47 CET LOG:  durée : 58.622 ms, instruction : SELECT COUNT(n.nid) FROM (SELECT DISTINCT ON (nid) * FROM node) n INNER JOIN term_node tn ON n.vid = tn.vid AND tn.tid = 27 LEFT JOIN history h ON n.nid = h.nid AND h.uid = 1 WHERE n.status = 1 AND n.created > 1234369419 AND h.nid IS NULL
2009-03-13 17:23:47 CET LOG:  durée : 54.749 ms, instruction : SELECT COUNT(n.nid) FROM (SELECT DISTINCT ON (nid) * FROM node) n INNER JOIN term_node tn ON n.vid = tn.vid AND tn.tid = 23 LEFT JOIN history h ON n.nid = h.nid AND h.uid = 1 WHERE n.status = 1 AND n.created > 1234369419 AND h.nid IS NULL
2009-03-13 17:23:47 CET LOG:  durée : 54.628 ms, instruction : SELECT COUNT(n.nid) FROM (SELECT DISTINCT ON (nid) * FROM node) n INNER JOIN term_node tn ON n.vid = tn.vid AND tn.tid = 24 LEFT JOIN history h ON n.nid = h.nid AND h.uid = 1 WHERE n.status = 1 AND n.created > 1234369419 AND h.nid IS NULL
2009-03-13 17:23:47 CET LOG:  durée : 53.412 ms, instruction : SELECT COUNT(n.nid) FROM (SELECT DISTINCT ON (nid) * FROM node) n INNER JOIN term_node tn ON n.vid = tn.vid AND tn.tid = 5 LEFT JOIN history h ON n.nid = h.nid AND h.uid = 1 WHERE n.status = 1 AND n.created > 1234369419 AND h.nid IS NULL
2009-03-13 17:23:47 CET LOG:  durée : 54.280 ms, instruction : SELECT COUNT(n.nid) FROM (SELECT DISTINCT ON (nid) * FROM node) n INNER JOIN term_node tn ON n.vid = tn.vid AND tn.tid = 19 LEFT JOIN history h ON n.nid = h.nid AND h.uid = 1 WHERE n.status = 1 AND n.created > 1234369419 AND h.nid IS NULL
2009-03-13 17:23:47 CET LOG:  durée : 53.303 ms, instruction : SELECT COUNT(n.nid) FROM (SELECT DISTINCT ON (nid) * FROM node) n INNER JOIN term_node tn ON n.vid = tn.vid AND tn.tid = 22 LEFT JOIN history h ON n.nid = h.nid AND h.uid = 1 WHERE n.status = 1 AND n.created > 1234369419 AND h.nid IS NULL
2009-03-13 17:23:47 CET LOG:  durée : 53.168 ms, instruction : SELECT COUNT(n.nid) FROM (SELECT DISTINCT ON (nid) * FROM node) n INNER JOIN term_node tn ON n.vid = tn.vid AND tn.tid = 21 LEFT JOIN history h ON n.nid = h.nid AND h.uid = 1 WHERE n.status = 1 AND n.created > 1234369419 AND h.nid IS NULL
2009-03-13 17:23:47 CET LOG:  durée : 54.421 ms, instruction : SELECT COUNT(n.nid) FROM (SELECT DISTINCT ON (nid) * FROM node) n INNER JOIN term_node tn ON n.vid = tn.vid AND tn.tid = 18 LEFT JOIN history h ON n.nid = h.nid AND h.uid = 1 WHERE n.status = 1 AND n.created > 1234369419 AND h.nid IS NULL
2009-03-13 17:23:47 CET LOG:  durée : 55.207 ms, instruction : SELECT COUNT(n.nid) FROM (SELECT DISTINCT ON (nid) * FROM node) n INNER JOIN term_node tn ON n.vid = tn.vid AND tn.tid = 20 LEFT JOIN history h ON n.nid = h.nid AND h.uid = 1 WHERE n.status = 1 AND n.created > 1234369419 AND h.nid IS NULL

This kind of log is a security issue as I can flod Apache sessions, PHP and also the SQL database.