promotion management after upgrade to business objects from 4.1 to 4.2 is very slow

promotion management after upgrade to business objects from 4.1 to 4.2 is very slow

It takes 4 minutes to load the page and once it loads it keeps being slow to promote....this is only happening with promotion management and other activities are working well....

From the suggestions in forums, I have this as following:

Xms512m -Xmx8g -XX:MaxPermSize=256m