Oh it can be slow, not all of the entity framework adaptors support bulk operations. I ended up extending it a bit on my object model to include bulk operation

Oh it can be slow, not all of the entity framework adaptors support bulk operations. I ended up extending it a bit on my object model to include bulk operations which do pretty much what you have there (I stuck to delete and insert though). However, I have used a pile of ORM products since the early C++ / smalltalk days back in the 1990s and it's easily the best ORM I've ever used.