Hi, on iPad, both slow and quick scrolling of pdf files (even with graphics) are very smooth. I can see the contents being displayed while scrolling. However, on my high-end Windows Yoga (16GB, SSD, i7 CPU) laptop, even scrolling of pdf with only text is not smooth. Asked another friend with Widows 2-1 laptops. He said that they are all like that even on high end 2 in 1 laptops. How come?