Wlfxb is rather slow 

Wlfxb is rather slow when marshalling and unmarshalling.
It hasn't been benchmarked though.

I doubt it is related to the frequent creation of JAXBContext, which is a rather expensive operation.
A new JAXBContext is created per marshall operation.
According to https://jaxb.java.net/guide/Performance_and_thread_safety.html, we'd better have one global single(or multiple cached) JAXBContext.
