Hi there!

Tough one.
Texts can slow down the program very much.
(I mean large text objects, as it seems to me it has nothing to do how you create it. As long as it is a text object, it has many more information than just being a group of paths.)
Once you make a text object and paste the part of the book into it, convert it to a path (Ctrl+C), which will make it faster, however you would have to kern the letters manually.
Try the flowed text option, may it not freeze until that converting.