large time for qmail-ldaplookup on -m ?

[Sohan]

hi all,   am getting response time of 15 to 20 sec from qmail-ldaplookup on -m ( mail attribute ) whereis qmail-ldaplookup on -u ( uid attribute ) response comes without any delay ( 0 sec delay )   how can i solve this !!!   becoz it is affecting my qmail delivery of mails and the qmail queue is getting bigger ( over 50,000 !! )   thnx!   Sohan