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Pick the most appropriate containers by using this reference table for all the Flex containers with information on properties, comparisons, best usages and their Java/HTML counterparts.
You can actually use multiple duplicated remote objects to reduce the average response time. Think each remote object as a thread, so the more threads you have the quicker the work gets done.
Athena Framework for Flex offers a Flex client side UnitOfWork that acts like Session/EntityManager. It help you track changes, load partial objects and resolve relationships.