nss-pam-ldapd slower than nss_ldap

["????" <24537248 [at] qq.com>]

I used yum command to install the ldap_server ( version :2.3.43) and ,
  the same way to install two ldap_client .  the ldapclient_1 version is 2.3.43,the ldapclient_2 version is 2.4.23
when i excuted authconfig-tui to config the client on ldapclient_2 , it prompted me to install nss-pam-ldapd.
after all configuretions?? i found that , when i excuted the command "ldapsearch -x " on ldapclient_2 was more slowly than excuted on ldapclient_2.

any   solutions ?  


os informaiton are as follow
ldapserver OS  :centos 5.4
ldapclient_1 OS : centos 5.4
ldapclient_2 OS : centos 6.2
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