Radhika,
when we load the app, we are returning a json object from the xsjs side... we are using the recordsetToJSON function Thomas had shared with a while back.. anyways, the recordsetToJSON function has a switch statement and case statements where we were reading various data types... anyways, I commented out a couple of those case statements and I see that the en.json load time is less. I am wondering if the reason why SP09 has the ability to return a read json directly from a view is to fix this issue... based on the different scenarios I tested, I can conclude that in fact the reading of different data types and sending it back to the ui on app init then the en.json file takes longer to load.