One thing I always wondered with Backbone, since views are kept in memory, is there a performance penalty after some number of views are instantiated? If I've

One thing I always wondered with Backbone, since views are kept in memory, is there a performance penalty after some number of views are instantiated? If I've got a e-commerce store and a user wants to browse through 40 products, it seems like a view will be there for each of these products. Or am I doing it wrong?