I have 3rd party messaging apps Line and Whatsapp pinned to my start screen and I quite often find myself getting large delays in receiving message updates. I am not sure if this is a limitation of the OS or a bug in the application--I know WP7 has limitations.
Can 3rd party messaging apps run all of the time in the background (regardless of how many other apps are open) and still receive real-time messages in Windows Phone 8?