I don't thing it matters... the important thing here is to know the ip of your login server in order to rout correctly all the entering packets on port 5999. Idealy your login computer and the world computer could be the same.
I thing that world.exe is not that heavy and does not need much memory. On the oposite the zone server will handle all the zones informations and the players informations... it might be more usefull to get memory and CPU power there...
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