squid Tuning

[Sunny Bhatheja <opensource.linux4e@xxxxxxxxx>]

Hii Everyone,
                      I am using squid 2.6 STABLE6-5. So I am using 
squid  authentication with AD with the help of helper program 
squid_ldap_auth and squid_ldap_group for user based authentication . I 
have very good hardware for the squid server it is having 16 cpus and 64 
GB RAM.
So any one suggest me that how may users squid can support for this 
particular hardware .
If any one is having any documentation  for squid tuning/optimization 
then please send me

Thanks in Advance...
Waiting for positive response