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I have a large .pdf file (it's an electronic textbook) and was wondering how I could decrease the lag when scrolling. I tried breaking it up into smaller sections (about 20-page pdf's) but that didn't help. I'm thinking scrolling is so slow because each page is some sort of image.

So are there any other steps I can take to reduce the choppiness when scrolling?

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Most of the answers I see to this question - both here and around the web - treat the problem as if it is the exception case. Eg ultra large pdf, low ram, slow disk, some funny kind of document compression, etc. This behavior is not the exception and can be widely repeated across pdfs of different sizes and compositions and across Macs of various speeds. My particular case is a mid-2011 Macbook Air with 4GB RAM, an ssd and –  Matt Jul 26 '12 at 6:20
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5 Answers

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How is the PDF compressed? If it is black and white only, it may be using a compression method that leads to choppy behaviour.

I was recently dealing with a product manual that was a black and white only scan. It was compressed using JBIG2, and it stuttered enormously when scrolling, even on a top-of-the-line MacBook.

I opened the document in Adobe Acrobat, and recompressed it using ZIP, and the scrolling problem went away entirely.

If you have Acrobat Pro, the steps I took were: Open the file -> Save As -> "Optimised PDF" -> Change the "Monochrome Images" compression dropdown to "ZIP" -> Ok.

It does increase the size of the file (from 1.2 MB to 3 MB), but I can actually skim the document now.

I think it mostly boils down to the fact that JBIG2 is compute-intensive, and Most PDF applications don't render the document much ahead of the current page.


If you don't have Acrobat, and you can post the PDF, I can take a look at it for you.

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My university offers Adobe Creative Suite Premium 5.5, so as soon as I can, I'll download Adobe Acrobat, and try this out. –  Dante Dec 1 '11 at 10:15
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Using an alternate PDF viewer, eg. Skim, might improve performance.

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I tried it, and there was no substantial difference in the scrolling. Thanks for the suggestion though. I can definitely see this app coming in handy--just not for the reasons listed above. –  Dante Sep 30 '11 at 22:04
    
I have some eBooks with lots of images inside, usually I will use Skim instead of Preview to read those files. A bit improved. –  kukoo Oct 1 '11 at 3:45
    
It was, but I'm still having trouble scrolling. It probably has something to do with my pdf--it's strange behavior. I have a couple other textbook's that are thousands of pages long with images here and there, but I don't have the same problem when scrolling. –  Dante Oct 1 '11 at 4:55
    
Tbh as far as PDF readers go, preview is by far the fastest, simply because pdf support is built on a low level into os x. –  XAleXOwnZX Nov 30 '11 at 7:16
    
@XAleXOwnZX - What do you mean by "built on a low level into os x"? It's just another OSX app that happens to be from Apple and included with the operating system. Low level doesn't apply in this case. –  Matt Jul 26 '12 at 6:21
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What are the specifications of your Mac? If you have very little RAM, that might impact your system speed overall.

UPDATE According to your screen shot, this is a mid-2010 MacBook Pro with 4GB RAM. This is a fast computer with sufficient RAM for this task, so this is not the problem.

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That might be it. Here's a screenshot of my current system specifications. cl.ly/360X3E2T240j3x2q3M2r –  Dante Sep 30 '11 at 21:35
    
My 470 upgrades to 8G and SSD, but using Preview to view a PDF file with lots of images, have the similar problem as @Andrew. For such PDF file, change to use Skim will be a bit improved. –  kukoo Oct 1 '11 at 3:44
    
@Wheat Williams. I'm starting to think it probably has something to do with the file itself--usually I don't get this sort of behavior even with my other, larger pdf files. –  Dante Oct 1 '11 at 5:28
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"Print to pdf" then open result in Preview again. It is a temporary fix or you could resave it this way for a permanent fix.

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What sort of size savings does this provide on a 100 page PDF made of images? I have not found this to help with documents described here. –  bmike Nov 22 '12 at 20:29
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You could hit the space-bar which will open Preview.app The file won't open with any Adobe program that way and won't lag.

Works great unless you have to edit the files for example, because you cannot achieve that with Preview.app.

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