Problem in sending access reject.....

Hi all,
      I am using the freeradius-1.0.0
If I supply wrong password for the PPPOE username in access request
packet to radius server, it takes much more time to give the access reject.
     I am facing this problem only when I run the radius server in
-x(lowercase x) option. If I run with the option -X(upper case) or -sx it is
immediately sending the access reject. Why is it so? Can anybody tell the
reason?


Thanks,
Regards,
Ganesan N