Something that can affect performance a lot (I was bitten by this one, but 
still not 100% sure I got it fixed) is jndi lookup performance.

In our config it happened that jndi was sometimes dead slow (5 to 10s), and 
other times instantenious.

This was presumably caused by the RMI stubs including server name in their data 
but the hostname not being known on the client side. Easily fixed either by 
forcing the server to only return the ip address, or by setting the hostname/ip 
in the hosts file on the client side.

The easy way to check this is by doing a telnet to the server on port 1099.

Joachim

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