This article will tell you how to make your super slow OR super large files work with unrealBook. This will make them smaller and faster to load.
This article assumes you are using a Macintosh.
If you have a Macintosh, try this small app I wrote (download then unzip, then run). Drag all your slow/large PDF files onto this app. It will prompt you for a destination folder, then it will process all the PDF files that were dragged onto the window. There will be some cases where the PDF might become larger (not many) but they will all turn well in unrealBook.
Here is the app download link.
If your iPad is an older one (iPad 2 or iPad mini first version), it will help immensely with page turns and will eliminate multiple pages being turned when one foot press was made.
You can also use smallPDF which is an online site. Excellent in making your PDF turn faster.