Lightroom Classic CC interface is very, very slow on iMac Pro

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  • Updated 4 weeks ago
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Lightroom Classic CC (latest update atm) interface and other functions are very slow on iMac Pro. The actual edits and file renderings are quick, but interface is lagging, moving zoomed-in photo is very slow. 

Example - scrolling thru folder list on left side is lagging. Scrolling preset list is lagging. Moving photo around with touchpad/touch-mouse is very lagging. 

This is quite shocking to see on iMac Pro, which is supposed to be the super fast computer (and it is in any other respect, except Lightroom). 

Tried with and without GPU acceleration. Didn't notice any difference. 

Display is set to Default resolution. 
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Karlis Dambrans

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Posted 4 weeks ago

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Rick Spaulding, Community Specialist

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Hi Karlis,

Do any of the steps on this page help?

https://helpx.adobe.com/lightroom/kb/issues-lightroom-classic-7-2.html
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Karlis Dambrans

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No. I have very few images synced. 
And pre-computation shouldn't be the problem, as the compter is pretty powerfull. 


The problem most likely is some bug or something with interface on retina screen. If i change resolution to lowest - Lightroom speeds up. But then that ruins the whole point of have a large screen. 
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Ryan DeMont

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So I too have a problem with my Imac 4.2ghz '17. The best fix I got, and it's not a complete fix, is to adjust the display resolution. They say that because Mac's have so many pixels, Lightroom can't process images fast enough for them to rendered in real time. Which of course is ridiculous, at least to my non expert Lightroom software building self. It's frustrating because I bought my fast iMac mainly to use with Lightroom and photoshop. But when I adjust my screen resolution I get better results in lightroom. hopefully they'll fix this, but it does seem Mac's with 5k retina display (maybe yours is even more k in the retina's) are left out in lightroom right now