Photoshop CC 2017: Slow saving on macOS

  • 2
  • Problem
  • Updated 1 year ago
  • Solved
  • (Edited)
Since the update to 2017 CC Photoshop, it is taking far too long to save a moderately sized file. Up to 2 minutes for a 90MB file. I am running a 4 GHz iMac with an SSD Hybrid HD, 32GB of RAM and an AMD Radeon R9 M295X graphics card (4GB). The machine is plenty fast enough. Looking at the activity monitor reveals 30% core use, so not very conclusive. I discarded the settings file on photoshop startup, and was able to save one file at the correct speed, that is to say, about 2 seconds, then it reverted to the slow behaviour. Further discarding of the settings file did not change this behaviour.
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Paul Litherland

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Posted 2 years ago

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John Maguire

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Next time this happens, see how much memory PS is using. I'm experiencing similar situation but on a PC
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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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Is Photoshop up to date? https://helpx.adobe.com/photoshop/kb/uptodate.html

Are you saving to the local drive? An external drive? Or a server?
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Paul Litherland

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Yes, saving to the local drive. As I mentioned, in the one instance where it saved at the normal speed, it only takes two seconds
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David, Official Rep

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Hi Paul,

Do you have a bunch of fonts either on your system or in the file?  I'm assuming the normal speed and slow save files are the same size, right?

Thanks,
David
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Paul Litherland

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Thank you for your response David, I went through the font cache and conflict resolutions posted on that troubleshooting page, but unfortunately no luck. 
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Paul Litherland

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I think I found the problem. The photoshop images that were giving me the slow saves were coming from Lightroom. I had a look at the LR export settings for the tiff images and found that they were being compressed as Zip files. Compressing them as LZW or not at all seems to have resolved the slow saving issue.
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Paul Litherland

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Although this seems to have resolved the problem, why would resaving a 100MB tiff file with .zip compression take 50-60 seconds as opposed to 3 seconds? just wondering, and not entirely convinced this was the only reason for the slowness.
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Max Johnson, Champion

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The save-as-tiff dialog in Photoshop lets you choose LZW vs Zip as compression options and specifically calls out that Zip is smaller files but longer save-time. It's because the zip algorithms used to crush the file size down are much more complex and CPU intensive.

So the extra time is your CPU stuffing a comforter-quilt into a soda can. When that's done, the actual write-to-hard-drive time is probably almost the same.
(Edited)
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Paul Litherland

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Thank you for this clarification! I just hope I remember 5 years from now when I have the same issue.