In a common scenario of Web application, we usually populate 
cellTable,cellList with our data from RequestFactory context's method, such 
as findAll(), at this point , we already done  the database query that get 
all entity ,but RequestFactory dictate that , to prepare with appropriate 
manipulating methods , RF has to go over the list again one by one 
,resulting in additional n queries whose result set already in the 
memory.As I monitored in the console, the overhead is substantial, even 
with JPA batching present, the performance is still crippled.

According to this 
post<http://stackoverflow.com/questions/6083346/requestfactory-and-findentity-method-in-gwt>
 in 
stackoverflow , we surely can override ServiceDecorator,but it seems that 
we lose the control over what we can do with this entity.

By far I can not think better solution for this, may be go back to GWT RPC 
is good idea.

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