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Scrollable dataTable should works fine with rows limited to 20 rows for example. Then it will fetch the data for others via ajax. And extendedDatatable loads all the data to the client. So in case you have much rich:components (calendars, toolpits, inplaces.. and so on) it will affect the performance much because of too much of js objects created.
In the past I have written about the problem and possible optimizations in specific case of calendar component usage http://www.jroller.com/a4j/entry/richfaces_calendar_component_shared_calendar
IIya , Thanks for the reply.
Have replaced ExtendedDataTable with ScrollableDataTable as suggested , It is taking quiet some time to fetch and synchronize the data but it should serve the purpose for now. Thanks a lot for your timely help