P: Slow UI when using Mac and Custom Display Profile

This should help:

https://helpx.adobe.com/download-install/using/install-previous-version.html

How Can I revert to v 9.4? I dont know if I have it anymore. I haven’t figure out to keep older versions.

It would be nice for Adobe to update us as to how the progress is going for them to fix what they broke. Lightroom is the variable that changed, and having custom calibrated display profiles is hardly a new thing and is necessary for color workflow.

No update to this issue in over two months. Can you give us an update @Rikk ?

Good question @7497175!

Took me a while to get back to this. I toyed with he idea of a clean install of Big Sur but I figured I'd try rolling back Lightroom to V10. It actually worked much to my surprise! I'll be more cautious with he next update. 

LR10 came out in October we are about to hit January 2021... where is the fix??

LR10 came out in October we are about to hit January 2021... where is the fix??

Gonna add my hat to the ring. This computer should run lightroom with ease but it's basically been a pain ever since buying it. Searching for photos is painfully delayed, I start scrolling and it will stop about 2 minutes later.  Develop module is also painfully slow.  Adobe please fix these issues.  It did work well for a moment in time after some updates then version 10.0 came along and back to complete crap.

Mac Pro 2019 

3.3 GHz 12 core

192GB Ram

8TB SSD

48 TB Raid

Pro Vega II 32 GB Graphics

Apple Pro Display XDR + BenQ 4k

Belinda is 100% correct. In my experience, every major update from Adobe is rolled out too soon with all sorts of compatibility issues. Every. Single. Time. But we all stick with them because Photoshop, Lightroom, etc. are the best when they work. And Adobe knows it.  Which is why this thread  has gone on for months without a solution. I downgraded to LR v9, re-did about three days worth of work since the v10 catalog is not is not compatible, and my workflow had resumed. If there was a viable alternative to LRC, I would use it in a second. But there simply is not. Shame on Adobe for putting us all through this dog’s dinner of an update. Once again. 

Yes of course it's software interacting with hardware (what else is there?) and yes, it could be a 101 other things and yes, you could try another monitor (assuming you have a bunch of monitors to hand) or you could try standing on your head and whistling yankee doodle. Bottom line is, it's perfectly good hardware trying to interact with poorly designed, inadequately tested and irresponsibly released bloatware.