JPA persistence tier / does two different layers make sense ?

I'm building a little application to illustrate performance issues we are encountering in our production system.
I will create a proof of concept a change we think it will resolve our problems. The change consist in building a specific lighter ejb layer with read only entities only with necessary attributes and relationships into to show data for selection and navigation into the application.
Does make any sense to put all this new ejbs in a different persistence model the one that already exists ?
What is the consequence to have two persistence model instead one for the project ?
My preference is to build two different layers (and related persistence model) and I think it is a good idea to separate the persistence layer because they have two different use, one for showing data and for navigation, one as a really persistence layer.
But i don't know what are the consequences ?

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