If you're using Netscape Directory Server 4.1x then you should set
the following

/usr/sbin/ndd -set /dev/tcp tcp_naglim_def 1

Solaris introduces a 100ms delay in TCP/IP. This parameter tells Solaris that any write that is smaller than N will be delayed. In iPlanet Directory Server 5 it is configurable, using the TCP_NODELAY flag, which is set by default, thus no delay for packets from the LDAP application. In other words in the 5.x series of directory server product you should not have to adjust this parameter, out-of-the-box it should work nicely.