Ext Ajax request async issue

Question

In Ext js, there is a Ext.Ajax.Request to get communicate with server and to get value, but in my application as it is async true, by the time it gets response from server, other code in the js is executing. I tried with async: false, it is impacting other functionality.

Please let me know if there is any other ext class to communicate and get value from server/ any way to handle this scenario.

Thanks in Advance