I swear! I can't understand! But this morning with all ACL's commented out, again, all works very very smoothly. Like a miracle!! :-) However, if ACL's is turned on after 10 minutes, running squid, speed goes down. I have the same rules(acl's and http_access) in both servers. There is only one difference between servers: Linux server, where all works fine, is using basic scheme authentication. This is the config: auth_param basic program /usr/lib/squid/smb_auth -W XYZ -U 192.168.X.X auth_param basic children 10 auth_param basic realm Servidor proxy auth_param basic credentialsttl 2 hours auth_param basic casesensitive off FreeBSD new server, where speed is too much slow, is using NTLM scheme authentication. This is the config: auth_param ntlm program /usr/local/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp auth_param ntlm children 25 auth_param ntlm keep_alive on I wanna to believe the problem is relating with authentication scheme. any suggestions? regards.. -- Att. Lutieri G. B.