Free Radius performance variation

Hi, I am testing for performance of FreeRadius Server 2.1.7 with the radclient utility. With 1000 users i am getting 125 Auths/sec and with 10000 users it is 80 Auths/sec. Why this drastic variation when the no of users is just a tenfold increase... Regards, Tejesh ________________________________ This Email may contain confidential or privileged information for the intended recipient (s) If you are not the intended recipient, please do not use or disseminate the information, notify the sender and delete it from your system. ______________________________________________________________________