Many LDAPv3 providers support Paged Search Results. I think we should provide the support via the LDAP Identity Store implementation if configured.

http://docs.oracle.com/javase/tutorial/jndi/newstuff/paged-results.html

The list of ldap v3 servers with this support are:
http://blog.dzhuvinov.com/?p=627

The RFC in question is http://www.ietf.org/rfc/rfc2696.txt