Using OEL and 11g, an old / invalid DNS ip address in the first line of resolv.conf adds 60 seconds to each connection, causes very slow LOCAL=NO connections. The ip address in resolv.conf are checked from the top down. If the first IP Address is BAD, it waits 60 seconds to timeout. During the EBS 1211 MP it adds about 35 hours with 125K jobs, for a total of 53 hours. It runs in 18 hours using the correct DNS server in resolv.conf. It happens that the DB and AS are on the same server and should logically use a BEQUETH connection to eliminate the network performance issue.
The other option is to turn off DNS in the /etc/nsswitch.conf.