Language / API add 1 entity add 10 entities add 100 entities fetch 1 entity fetch 10 entities fetch 100 entities update 1 entity update 10 entities update 100 entities delete 1 entity delete 10 entities delete 100 entities
Python                        
JDO                        
Low-level API(Java)                        

NOTE: I don't know how to do batch operation with JPA, so I don't test it.