IBooks author becomes sluggish

I am writing a book in iBooks author using several small PDF files for illustrations, some  inline and some anchored.  After I place 2 or 3 of these files IBooks author becomes very sluggish...there is a noticeable lag between pressing a key and seeing the letter appear on screen.  The files I am working on are not large...one is  11 megabytes but the other is only 800K.  I am using a 2011 MacBook Air with 4GB of memory, running OXS 10.7.3.
Does anyone else have this problem?  Has anyone found a solution?

People have experienced similar problems when a document contains lots of high-resolution images or lots of video. I would try editing the book with a shorter placeholder version of the included documents and then add the real thing at the very end. That might make it a bit more bearable to work with it.
IBA struggles when a book contains large media.
Michi.

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