01-09-2015, 11:05 PM
Using Preview 8 to look at JPGs, even large ones, is fine. The PDFs I'm having problems with are about 18 MB (textbook page proofs), and Preview has a hard time with them. It is slow and jerky scrolling to the next page, I get spinning beach balls, etc. I Googled this and saw a number of posts about it on the Apple support forums, and a lot of "me too" followups. One poster suggested using Preview 7, and that's working for me. Maybe it's a function of my older Mac Pro 3,1? I had no problem with these big PDFs whatsoever in Preview when I had 10.6.8.