Is there a way to increase scrolling speed?

I need to use ADE for my 7 textbooks this year and for some reason scrolling is very slow. I think it may be because of the highlights I have taking up too much memory or something...  So far, I zoom out just enough to be able to jump half a page by hitting the left/right keys, but even this is too slow when I want to go more than one page forward or back... I'm using a 2 year old Macbook pro.  What can I do to speed things up?