Do Individual Method Calls Waste Bandwidth?

Serialization makes deep copies. This can lead to many objects being serialized and sent over.
Object types that can be of arbitrary size (e.g., a Vector or ArrayList) are usually a bad choice for a return type.
- They degrade perceived client performance.
- They increase performance variance.
- They involve a large, all-at-once network hit.
- They involve a larger single-client commitment on the part of the server.
- They penalize client mistakes.