I am experiencing a very annoying issue, with large pdf files the preview app is almost unusable. Zooming and scrolling is terrible slow and the app becomes unstable. Preview in Mavericks handles the same files on the same hardware without issues. MacBook Pro Retina 13 Late 2013 8GB RAM 2.5GHz i5 150GB free on 256GB SSD Please help!. PS: other apps based on the Mac pdf kit like Pdf Pro and the Graphpad Prism viewer behave the same.