Q: PDFKit problem with full screen redraw
I do a lot of presentations in PDF (they are usually created with LaTeX, but I as will explain below, this detail is irrelevant to the problem).
Very often a slide is shown in increments - think of several bullet points that are revealed one by one.
What really happens is that each stage is a separate page, but the user should not notice it.
So if you have a bulleted list
•A
•B
•C
there are really three separate pages (one containing just A, one A and B, and one with A,B,C).
When you advance to the next overlay, it appears that a B was added to the screen, then a C (even though each time a full page is replaced by the next).
In Sierra this screen redrawing is not smooth and the audience can clearly see the screen "shaking".
I tested this on two machines. I did a test Keynote presentation, which looks great; and then did the same with the PDF version and it is shaky. This was regardless of which program I used to display it (Preview, Skim, TeXShop), which indicates that the problem is in the common framework they all use - PDFKit.
I have already submitted feedback to Apple, but I would to hear if people are also seeing this; just to make sure it is not something weird on my machines.
MacBook Pro with Retina display, macOS Sierra (10.12)
Posted on Sep 26, 2016 6:28 AM