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We're sorry about the sluggish performance of Lightroom Classic CC on your iMac Pro. This issue is definitely recorded and being worked upon as it does affect the app's performance and slows down the overall workflow . I'd recommend that you add your vote and feedback to the below discussion where our Engineers are tracking this issue. This way they can interact with you and they'll also get to know more about the problem. Here's the link for the discussion: Lightroom Classic CC interface is very, very slow on iMac Pro | Photoshop Family Customer Community
3 months later and still working through an absurdly sluggish workflow day in and day out.
Is real time editing on a 4/5k monitor that difficult of a code to crack? Odd that I can edit 4k video in realtime, full resolution, and my computer eats the footage easily, but a simple RAW photo edit slows things to a crawl.
This needs to be fixed.
8 months later and STILL worse than ever.
This application is built to be professionally used. I've sunk hundreds if not thousands into CC subscriptions. This is insanity.