Entity framework - All tables in one edmx file

Will putting all my tables in a single edmx significantly harm performance? I have heard this is a bad practice, but this was before entity implemented lazy load. So, now that we have entity 4, is it a non-issue?

I plan to abstract my Models by extending the partial classes 开发者_开发百科of each generated entity, implementing ICrud<ConcreteModel>. This, combined with MVC3 should nullify any coupling concerns.

Yes, it does hurt the performance. Performance Issues in Metadata Load Times and in View Generation are the results of a big EDMX model.

Take a look at this post where I discussed this matter at length:

Entity Framework 4: Does it make sense to create a single diagram for all entities?