Why is the first lookup() relatively slow?

Hello hello,
I am doing load testing on an LDAP server right now. The first call to lookup() is an order of magnitude slower that subsequent lookup() calls over the same Context instance. Why?
I create a few instances of Context using Sun's InitialContext factory. I loop through a few lookup() requests over each of those Contexts. The first lookup takes 800 milliseconds, and all subsequent lookups take less than 20 milliseconds.
I believe that this has nothing to do with socket operations because I don't start the lookup thread until after its Context has been created. I've also checked the BER buffers sent and received by the LDAP provider, and verified that the security authentication is complete before I start timing the lookup.
Finally, I've also ensured that server-side caching does not cause subsequent requests to speed up.
This might have something to do with the operation of the particular LDAP server I'm using, OpenLDAP.
Has anybody else noticed similar behavior by a Context?

Im also having a similar problem. It takes about 1.2 seconds to create the InitialDirContext object.
DirContext ctx = new InitialDirContext(env); //takes about 1.2 sec
Im using eDirectory (Novell Directory Service). Im using 'simple' authentication and Im suppling the ID and password in the environment variables.
Did you find out anything?

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Why is the first lookup() relatively slow?

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