Photoshop 2019 & 2018 very slow to open PSD files on Mojave OS

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  • Updated 6 months ago
Opening about a 320MB psd file in Photoshop 2019 takes a very long time.
With High Sierra it takes about 1 minute, but under Mojave it took around 2hrs.
This was tested on quite old hardware, MacBook Pro 2015.
They were tested on fresh installs of the OS and app, have also tested with Photoshop 2018.
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Posted 8 months ago

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David, Official Rep

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Hi Craig,

How slow is Photoshop opening these files?  Are we talking seconds or minutes?  What's the size/type of these files?  Are you having this problem with all documents?  Could Photoshop be doing some task in the background, such as synching files?

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Hi David,

Very slow, as stated in the initial post it took 1:50hr to open.
I have just completed some more testing.
Works ok under OSX 10.14.5
Fails under OSX 10.14.6
Works ok under OSX 10.14.6 supplemental update 2.
So it was an Apple bug causing the issue.

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Same issue here, did not get fixed with supplemental update. HDs benchmark fine otherwise, It's only photoshop