Lightroom Classic CC: Slow preview in full screen (F)

  • 2
  • Problem
  • Updated 4 weeks ago
  • Acknowledged
  • (Edited)
It has become painfully slow in Mac Mojave when I press “F” to view previews in Full screen. Takes about two secs to switch between pics, even if previews already exist. It goes instantly to switch between pics in Loupe mode. Tried turning graphic processor on and off, without significant difference. 
(On an 27" iMac 4 GHz Intel Core i7 24 GB)
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Leif Elison

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Posted 2 months ago

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Rikk Flohr, Official Rep

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Leif, can you go to Help>System Info... and copy and paste your Lightroom Version number in the comments here?

Thanks!
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Leif Elison

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Lightroom Classic-version: 7.5 [ 1186149 ]
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Rikk Flohr, Official Rep

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Retagging thread: moving from Lightroom CC to Lightroom Classic CC.
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Rikk Flohr, Official Rep

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Are you in Library or Develop when the slowness occurs? 
Is there any difference between the full screen in Library vs. Develop?
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Leif Elison

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It is the same in Library and Develop.
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Victoria Bampton - Lightroom Queen, Champion

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I tried this a couple of days ago after a Twitter report and was able to reproduce it in Library. I didn't check Develop.
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Rikk Flohr, Official Rep

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Leif, 

If you:

1. Hit [Shift]+[Tab] to hide all panels
2. Hit [Shift]+[F] twice to toggle into full screen (slightly different than just the [ F ] key)

Is the performance any different?
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Leif Elison

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That works much faster, almost instant.
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Rikk Flohr, Official Rep

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That is a good clue... thanks. 
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Rikk Flohr, Official Rep

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One of our QE was able to duplicate so we've opened an issue. Thanks for the reports.
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Leif Elison

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Great, thanks for your attention!
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Gary Suskauer

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Hello, I am having the same issue on my brand new MacBook Pro 13 running Mojave.  The performance improves when I use the [Shift] + [Tab] and [Shift] + [F] noted above.  Was a permanent fix ever found?  My new machine is running the 2.7 GHz Intel Core i7 with 16 GB of RAM and I never had this issue on my 2013 MacBook Pro.