Large amounts of text in flash

I need to program a viewer for a 600 page book in flash. I have the entire book in a single xml-file, but am expecting performance issues if i just load the whole thing at startup.
I am badly in need of good ideas on how to make this work.
If you know of any examples of huge amounts of text being shown in flash please point me to them.

If you have any ideas on how to increase performance please post.