A while back, I took some time to familariase myself with the Lightweight Directory Access Protocol (LDAP) from a performance testing standpoint. The following post is the outcome of that investigation and can provide a technical starting point for performance testing LDAP . It is not designed as a definitive reference and I implore you to submit corrections and improvements in the comments.
This post discusses several methods for testing the LDAP protocol using LoadRunner, one using JMeter, and a final using a PHP harness.