Are you reading it using Adobe Digital Editions (ADE) on a PC?
That is not a very good bit of software, but is not usually too slow, there may be something odd about the book.
You could try installing the Sony Reader software on the PC and seeing if that is any faster: I doubt it will be but worth a try.
That software is intended for use in conjuction with Sony eReader devices, but can be installed and used on any PC.
Unfortunately it is a Mac OSC 10.6.8... Is it worth it to try your suggestion anyway? Thank you for replying.
I've never tried it on Mac, but it says it works there so worth a shot.
Not sure about exact Mac versions.
I'm afraid even if it works it may be just as slow as ADE ~ but the only way you'll know is to try it.
It's marginally better, so thank you!