The title says it all. It is virtually impossible to view any large PDF files with Preview in Yosemite (early 2014 11" MacBook Air, base model). After every page scroll, the app freezes and gives me the spinning rainbow wheel for about 30 seconds, and then scrolls down like crazy, like it was spring loaded or something. And the scrolling is VERY laggy! Didn't have this problem in Mavericks. Anyone who can relate?