JBoss eap 6,JBossws-cxf 4 Closing the ws port

Hello, I am working respecting the JAX-WS specification and would like to know if there is any method to close the port.

With the metro WS, I can use this

((com.sun.xml.ws.Closeable) port); 

Is there any need to close the port especially for performance reasons?

Thanks.