Hi Sid,
Your picture didn't post, so I'm making some general observations...
Does any of the text have the aligment set to justify? In justify aligment, every letter is treated as a seperate object to process in Flash, so render times get to be extreme. Change this to Center, Left or Right aligment to solve the issue, and Articulate will again treat text as a single object.
If you still have problems, try applying a .1 character spacing to the font by selecting it, right clicking and going to the Font option. This forces Articulate to treat the text like a picture and again, should force better results.
If you post the picture, maybe there is more to try...