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Old Feb 12, 2013, 06:57 AM   #1
Spectrum
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Join Date: Mar 2005
Location: UK
Very slow PDF rendering in Preview

I have a few PDF files that render some of the pages (complex line art) VERY slowly.

Here is an example:

https://www.dropbox.com/s/ph171hsj4p...PDF%20page.pdf

It even causes the Dropbox/Safari PDF viewer to hang!

Interestingly, if you download and open the file in Preview but shrink the window so that the page is slightly smaller than the "Open at actual size", the rendering becomes instant.

For some reason, going at least to 100% size causes one of the processor cores to get pegged at 100% for a few seconds while the images get drawn.

The same does not happen when using Acrobat (but the software is otherwise not nice to use).

I have other software (Sente) that uses the Preview rendering engine, so it is also slow.

This is on 10.6.8 on a quad core mini i7. Anyone else see the same problem in Lion and above?
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Old Feb 12, 2013, 07:38 AM   #2
JackRoch
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Doesn't seem to cause any problems in SL on my 2010 iMac.

Have you tried Skim?
http://skim-app.sourceforge.net/
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Old Feb 12, 2013, 08:22 AM   #3
Spectrum
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I just tried Skim. Same problem. The PDF renders fine whilst the window is small, but as soon as I zoom into the PDF or increase the window size (with Automatically resize selected) the rendering takes at least 3-4 seconds - with each panel (A, B, C, D) rendering individually. 1 CPU core gets pegged at 100% during this.

Could it be a graphics card (HD3000) problem?

To test this, I can try at home later on a MBPro with and without discrete graphics enabled.

EDIT:Out of interest, what version of Preview do you have? Mine is 5.0.1

EDIT2: I just booted into Lion and tried it. Same problem. Very slow to render once the image is viewed at greater than "Actual size".

Last edited by Spectrum; Feb 12, 2013 at 08:39 AM.
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Old Feb 12, 2013, 07:04 PM   #4
JackRoch
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Drat. I see what you mean now: dreadfully slow redraw here too.
I tried printing as pdf, pdfx, etc in the hope that it might force some change in the document but no luck when opening the resulting files in both Preview and Skim.

I did try opening it in PDFpen (demo version). Initially it opens quickly and thereafter for 6 or 7 clicks of the '+' button until transition from 161% to 177% whereupon it slows - perhaps not quite as much as in Preview.

Really sorry to have given you false hope in my first post!
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Old Feb 14, 2013, 03:55 PM   #5
Spectrum
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Just wondering if this PDF renders quickly on anyone's system?

Mountain Lion perhaps?
Or on a 24 core MacPro?
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Old Feb 18, 2013, 05:14 AM   #6
Gogol
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Join Date: Jan 2013
Location: The Netherlands
I have the same problem on late 2012 27" iMac (10.8.2)
How is the document created?
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