Performance testing is an expensive exercise. It takes specialist skills and a significant amount of planning and understanding of the application in order to replicate the hundreds or thousands of users you are expecting. Another option of course is to let your end users do the performance testing for you. Take the announcement from Blizzard below for Diablo III.

Beginning this Friday everyone is invited to log in and help us put the game and servers through their paces in this three day stress test as we march toward the game’s release.
It is really viable to get your end users to stress test your application?
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Quick tip: If you find VuGen is running slowly, it’s probably because you have the parameters data file open.
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.