ajax event when partial response chunk done

ajax event when partial response chunk done

I have a page that takes about 15 seconds to complete. But the page starts outputing content after a half second. Is there a way for jquery to throw an event at that time? For every chunk?

Maby there is a plugin that I can use where I can define "chunk"? Maby an event when there is a newline or some other marker.

My visitors would rather see something else than "please wait", if possible.