ldapwhoami has the same behaviour

[root@ldap1 ~]# time ldapwhoami -xZZh ldap1.ldapnet.tmapy.cz anonymous Result: Success (0)

real 0m4.835s user 0m0.021s sys 0m0.012s

[root@ldap1 ~]# time ldapwhoami -xZZh ldap2.ldapnet.tmapy.cz anonymous Result: Success (0)

real 0m0.042s user 0m0.023s sys 0m0.013s