I have deployed web application like below

MyWebApp.war ---> which has web tier MyEjb.jar --> which has all ejbs 

Both are deployed in the domain mode.

and while invoking the same I use

java:global/MyEjb/... 

This works but I want to know the performance impact as it is deployed on the same server. And also what needs to be changed if I want to access it as local.

As If I access it with java:app/MyEjb/.. It is not able to find the bean.