I have a few larger (20 - 60 mb) pdf files....I have a few viewers downloaded to view them. They all work "average" when turning page by page, however, when I want to example go to a page further down...ie. page 250, it takes about 2 - 3 mins to finally get to the requested page. On a pc, using Acrobat, it is instant. I was hoping to use this for training, but if this is the speed, it is useless.