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On both OSX and PC, when reading PDF slides or e-book today I still experienced the lagging problem when quickly scrolling through pages. Both in-browser or in application like OSX's Preview, Windows' Reader, experienced the same thing.
Because I imagined the task of just displaying something is not a big deal and should be fast by now. How come my 3D games runs a lot smoother and update quicker than a PDF file?
Maybe your PDFs use a lot of big and very compressed images, and since PDF files and viewers are not optimized for heavy rendering workloads you experience that lag. It doesn't matter how fast and powerful a computer is, if the code is not correctly optimized to use the hardware correctly, things just won't work right. – arielnmz – 2015-07-13T05:14:10.037
For what it's worth, I noticed a considerable faster loading time using sumatra pdf instead of acrobat XI. – jiggunjer – 2015-12-05T07:55:14.157