hi Padmanja,
Java mapping is also very good, graphical mapping also converted into .class files internally. if change java mapping into graphical mapping i think problem will not solve.
if you resolve the isssue first we need to clarify 2 things.
1. first you check java mapping in to java compiler or editors and observe how much time taken to execute that code(eclipse or other editors).
2. check performance monitoring in RWB.(for that interface how much time taken in pipeline steps).
3. check in Pipeline steps which pipe steps take delay.
Regards,
Kiran Polani