So good news is that RMI has enabled very active distributed computing research and indeed development as in JavaSpaces from Sun
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Performance is reasonable but insufficient for some applications
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It is already good enough to get started and for instance outperforms many (Java) CORBA implementations
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Forum suggests (optional) changes in several areas including
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Serialization -- this is used in Persistent object storage and to transmit objects between different programs in a distributed application -- can be optimized differently for each case
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Transport Layer -- need to be able to layer RMI interfaces over fast transport mechanisms -- Myrinet, native ATM etc.
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